分?jǐn)?shù)混合運(yùn)算專(zhuān)項(xiàng)練習(xí)題集400道（涵蓋基礎(chǔ)、進(jìn)階、綜合全題型，附解題思路指引）編寫(xiě)說(shuō)明分?jǐn)?shù)混合運(yùn)算是小學(xué)數(shù)學(xué)的核心知識(shí)點(diǎn)之一，是后續(xù)學(xué)習(xí)分?jǐn)?shù)應(yīng)用題、百分?jǐn)?shù)、比例等內(nèi)容的基礎(chǔ)。本練習(xí)題集旨在通過(guò)分層專(zhuān)項(xiàng)訓(xùn)練，幫助學(xué)生系統(tǒng)鞏固分?jǐn)?shù)混合運(yùn)算的規(guī)則、技巧與實(shí)際應(yīng)用能力。1.適用人群小學(xué)五、六年級(jí)學(xué)生，初中預(yù)備班學(xué)生，以及需要強(qiáng)化分?jǐn)?shù)運(yùn)算能力的學(xué)習(xí)者。2.內(nèi)容結(jié)構(gòu)基礎(chǔ)篇（120題）：聚焦分?jǐn)?shù)加減、乘除及簡(jiǎn)單混合運(yùn)算，夯實(shí)運(yùn)算規(guī)則基礎(chǔ)。進(jìn)階篇（160題）：拓展含括號(hào)運(yùn)算、分?jǐn)?shù)與小數(shù)混合、簡(jiǎn)便運(yùn)算，提升運(yùn)算靈活性。綜合篇（120題）：結(jié)合實(shí)際問(wèn)題與復(fù)雜混合運(yùn)算，培養(yǎng)應(yīng)用意識(shí)與綜合能力。3.使用建議每天練習(xí)10-20題，注重解題過(guò)程而非僅答案，培養(yǎng)嚴(yán)謹(jǐn)?shù)倪\(yùn)算習(xí)慣。錯(cuò)題需標(biāo)注并分析原因（如通分錯(cuò)誤、運(yùn)算順序混淆），定期復(fù)習(xí)鞏固。進(jìn)階篇與綜合篇建議在掌握基礎(chǔ)后逐步挑戰(zhàn)，避免過(guò)度焦慮。一、基礎(chǔ)篇（120題）目標(biāo)：掌握分?jǐn)?shù)加減、乘除的基本規(guī)則，能正確進(jìn)行不含括號(hào)的簡(jiǎn)單混合運(yùn)算。（一）分?jǐn)?shù)加減混合運(yùn)算（40題）1.同分母分?jǐn)?shù)加減混合（20題）（1）\(\frac{1}{5}+\frac{2}{5}-\frac{1}{5}\)（2）\(\frac{3}{7}-\frac{1}{7}+\frac{2}{7}\)（3）\(\frac{5}{9}+\frac{3}{9}-\frac{4}{9}\)（4）\(\frac{7}{10}-\frac{3}{10}-\frac{2}{10}\)（5）\(\frac{2}{3}+\frac{1}{3}-\frac{1}{3}\)（6）\(\frac{4}{5}-\frac{2}{5}+\frac{1}{5}\)（7）\(\frac{6}{11}+\frac{3}{11}-\frac{5}{11}\)（8）\(\frac{8}{13}-\frac{5}{13}-\frac{1}{13}\)（9）\(\frac{1}{4}+\frac{3}{4}-\frac{1}{2}\)（10）\(\frac{5}{6}-\frac{1}{6}+\frac{1}{3}\)（11）\(\frac{3}{8}+\frac{5}{8}-\frac{7}{8}\)（12）\(\frac{9}{14}-\frac{5}{14}+\frac{3}{14}\)（13）\(\frac{2}{7}+\frac{4}{7}-\frac{5}{7}\)（14）\(\frac{10}{15}-\frac{4}{15}-\frac{3}{15}\)（15）\(\frac{1}{9}+\frac{7}{9}-\frac{5}{9}\)（16）\(\frac{12}{17}-\frac{8}{17}+\frac{4}{17}\)（17）\(\frac{3}{10}+\frac{5}{10}-\frac{7}{10}\)（18）\(\frac{11}{12}-\frac{5}{12}-\frac{3}{12}\)（19）\(\frac{4}{9}+\frac{2}{9}-\frac{5}{9}\)（20）\(\frac{7}{8}-\frac{3}{8}+\frac{1}{8}\)2.異分母分?jǐn)?shù)加減混合（20題）（1）\(\frac{1}{2}+\frac{1}{3}-\frac{1}{4}\)（2）\(\frac{2}{3}-\frac{1}{4}+\frac{1}{6}\)（3）\(\frac{3}{5}+\frac{1}{2}-\frac{2}{3}\)（4）\(\frac{4}{7}-\frac{1}{3}+\frac{1}{2}\)（5）\(\frac{1}{5}+\frac{2}{7}-\frac{1}{3}\)（6）\(\frac{3}{4}-\frac{1}{5}+\frac{1}{2}\)（7）\(\frac{2}{5}+\frac{3}{8}-\frac{1}{4}\)（8）\(\frac{5}{6}-\frac{2}{3}+\frac{1}{5}\)（9）\(\frac{1}{3}+\frac{1}{4}-\frac{1}{6}\)（10）\(\frac{4}{5}-\frac{3}{7}+\frac{1}{2}\)（11）\(\frac{2}{7}+\frac{3}{10}-\frac{1}{5}\)（12）\(\frac{5}{8}-\frac{1}{4}+\frac{1}{3}\)（13）\(\frac{1}{6}+\frac{2}{9}-\frac{1}{12}\)（14）\(\frac{3}{7}-\frac{1}{6}+\frac{1}{3}\)（15）\(\frac{2}{3}+\frac{1}{5}-\frac{3}{10}\)（16）\(\frac{4}{9}-\frac{1}{5}+\frac{1}{2}\)（17）\(\frac{1}{4}+\frac{3}{8}-\frac{1}{2}\)（18）\(\frac{5}{7}-\frac{2}{5}+\frac{1}{3}\)（19）\(\frac{2}{5}+\frac{1}{6}-\frac{1}{3}\)（20）\(\frac{3}{8}-\frac{1}{6}+\frac{1}{4}\)（二）分?jǐn)?shù)乘除混合運(yùn)算（40題）1.分?jǐn)?shù)乘整數(shù)與分?jǐn)?shù)乘分?jǐn)?shù)混合（20題）（1）\(\frac{2}{3}\times6\times\frac{1}{4}\)（2）\(\frac{3}{5}\times10\times\frac{2}{7}\)（3）\(\frac{1}{2}\times4\times\frac{3}{8}\)（4）\(\frac{4}{7}\times14\times\frac{1}{2}\)（5）\(\frac{5}{6}\times12\times\frac{3}{10}\)（6）\(\frac{1}{3}\times9\times\frac{2}{5}\)（7）\(\frac{2}{9}\times18\times\frac{1}{4}\)（8）\(\frac{3}{10}\times20\times\frac{1}{6}\)（9）\(\frac{4}{11}\times22\times\frac{3}{8}\)（10）\(\frac{5}{12}\times24\times\frac{1}{5}\)（11）\(\frac{1}{4}\times8\times\frac{3}{4}\)（12）\(\frac{2}{5}\times15\times\frac{2}{3}\)（13）\(\frac{3}{7}\times21\times\frac{1}{3}\)（14）\(\frac{4}{9}\times18\times\frac{3}{8}\)（15）\(\frac{5}{11}\times22\times\frac{1}{10}\)（16）\(\frac{1}{6}\times12\times\frac{5}{6}\)（17）\(\frac{2}{7}\times21\times\frac{2}{3}\)（18）\(\frac{3}{8}\times16\times\frac{1}{4}\)（19）\(\frac{4}{10}\times30\times\frac{1}{6}\)（20）\(\frac{5}{12}\times24\times\frac{3}{10}\)2.分?jǐn)?shù)除以整數(shù)與分?jǐn)?shù)除以分?jǐn)?shù)混合（20題）（1）\(\frac{4}{5}\div2\div\frac{1}{3}\)（2）\(\frac{5}{6}\div3\div\frac{2}{5}\)（3）\(\frac{3}{4}\div4\div\frac{3}{8}\)（4）\(\frac{2}{7}\div5\div\frac{1}{14}\)（5）\(\frac{6}{11}\div6\div\frac{3}{22}\)（6）\(\frac{1}{3}\div2\div\frac{1}{6}\)（7）\(\frac{3}{5}\div3\div\frac{2}{5}\)（8）\(\frac{4}{9}\div4\div\frac{1}{9}\)（9）\(\frac{5}{8}\div5\div\frac{1}{8}\)（10）\(\frac{7}{10}\div7\div\frac{1}{10}\)（11）\(\frac{2}{3}\div4\div\frac{1}{6}\)（12）\(\frac{3}{4}\div6\div\frac{1}{8}\)（13）\(\frac{5}{7}\div10\div\frac{1}{14}\)（14）\(\frac{6}{13}\div9\div\frac{2}{39}\)（15）\(\frac{1}{2}\div3\div\frac{1}{6}\)（16）\(\frac{3}{5}\div5\div\frac{3}{25}\)（17）\(\frac{4}{7}\div8\div\frac{1}{14}\)（18）\(\frac{5}{9}\div10\div\frac{1}{18}\)（19）\(\frac{2}{11}\div4\div\frac{1}{22}\)（20）\(\frac{3}{13}\div6\div\frac{1}{26}\)（三）分?jǐn)?shù)加減乘除混合運(yùn)算（不含括號(hào)）（40題）（1）\(\frac{1}{2}+\frac{1}{3}\times\frac{3}{4}\)（2）\(\frac{2}{3}-\frac{1}{4}\div2\)（3）\(\frac{3}{5}\times\frac{1}{2}+\frac{1}{4}\)（4）\(\frac{4}{7}\div2-\frac{1}{7}\)（5）\(\frac{1}{5}+\frac{2}{5}\times\frac{5}{6}\)（6）\(\frac{3}{4}-\frac{1}{3}\div\frac{1}{2}\)（7）\(\frac{2}{3}\times\frac{3}{4}+\frac{1}{6}\)（8）\(\frac{5}{6}\div\frac{5}{7}-\frac{1}{7}\)（9）\(\frac{1}{4}+\frac{3}{4}\div3\)（10）\(\frac{4}{5}-\frac{2}{5}\times\frac{5}{8}\)（11）\(\frac{3}{7}\times\frac{7}{9}+\frac{1}{3}\)（12）\(\frac{5}{8}\div\frac{1}{2}-\frac{1}{4}\)（13）\(\frac{1}{6}+\frac{5}{6}\times\frac{6}{7}\)（14）\(\frac{2}{3}-\frac{1}{2}\div\frac{3}{4}\)（15）\(\frac{3}{4}\times\frac{4}{5}+\frac{1}{5}\)（16）\(\frac{5}{7}\div\frac{5}{14}-\frac{2}{7}\)（17）\(\frac{1}{8}+\frac{7}{8}\div7\)（18）\(\frac{4}{9}-\frac{1}{3}\times\frac{3}{4}\)（19）\(\frac{2}{5}\times\frac{5}{6}+\frac{1}{3}\)（20）\(\frac{3}{7}\div\frac{3}{14}-\frac{1}{2}\)（21）\(\frac{1}{9}+\frac{8}{9}\times\frac{9}{10}\)（22）\(\frac{5}{10}-\frac{1}{5}\div\frac{1}{2}\)（23）\(\frac{3}{8}\times\frac{8}{9}+\frac{1}{3}\)（24）\(\frac{5}{9}\div\frac{5}{18}-\frac{2}{3}\)（25）\(\frac{1}{10}+\frac{9}{10}\div3\)（26）\(\frac{4}{11}-\frac{2}{11}\times\frac{11}{12}\)（27）\(\frac{3}{13}\times\frac{13}{15}+\frac{1}{5}\)（28）\(\frac{5}{14}\div\frac{1}{2}-\frac{1}{7}\)（29）\(\frac{1}{12}+\frac{11}{12}\times\frac{12}{13}\)（30）\(\frac{2}{15}-\frac{1}{5}\div\frac{3}{2}\)（31）\(\frac{3}{16}\times\frac{16}{18}+\frac{1}{6}\)（32）\(\frac{5}{17}\div\frac{5}{34}-\frac{2}{3}\)（33）\(\frac{1}{18}+\frac{17}{18}\div17\)（34）\(\frac{4}{19}-\frac{2}{19}\times\frac{19}{20}\)（35）\(\frac{3}{20}\times\frac{20}{21}+\frac{1}{7}\)（36）\(\frac{5}{22}\div\frac{1}{2}-\frac{1}{11}\)（37）\(\frac{1}{24}+\frac{23}{24}\times\frac{24}{25}\)（38）\(\frac{2}{25}-\frac{1}{5}\div\frac{5}{2}\)（39）\(\frac{3}{26}\times\frac{26}{27}+\frac{1}{9}\)（40）\(\frac{5}{28}\div\frac{1}{2}-\frac{1}{14}\)二、進(jìn)階篇（160題）目標(biāo)：掌握含括號(hào)的運(yùn)算順序，能靈活進(jìn)行分?jǐn)?shù)與小數(shù)混合運(yùn)算，學(xué)會(huì)運(yùn)用運(yùn)算定律簡(jiǎn)化計(jì)算。（一）含括號(hào)的分?jǐn)?shù)混合運(yùn)算（60題）1.含小括號(hào)的混合運(yùn)算（30題）（1）\((\frac{1}{2}+\frac{1}{3})\times\frac{3}{4}\)（2）\((\frac{2}{3}-\frac{1}{4})\div2\)（3）\(\frac{3}{5}\times(\frac{1}{2}+\frac{1}{4})\)（4）\(\frac{4}{7}\div(\frac{1}{2}-\frac{1}{3})\)（5）\((\frac{1}{5}+\frac{2}{7})\times35\)（6）\((\frac{3}{4}-\frac{1}{5})\div\frac{1}{20}\)（7）\(\frac{2}{3}\times(\frac{3}{4}-\frac{1}{6})\)（8）\(\frac{5}{6}\div(\frac{5}{7}+\frac{1}{7})\)（9）\((\frac{1}{4}+\frac{3}{4})\times\frac{1}{2}\)（10）\((\frac{4}{5}-\frac{2}{5})\div\frac{1}{5}\)（11）\(\frac{3}{7}\times(\frac{7}{9}+\frac{2}{9})\)（12）\(\frac{5}{8}\div(\frac{1}{2}-\frac{1}{4})\)（13）\((\frac{1}{6}+\frac{5}{6})\times\frac{6}{7}\)（14）\((\frac{2}{3}-\frac{1}{2})\div\frac{3}{4}\)（15）\(\frac{3}{4}\times(\frac{4}{5}-\frac{1}{5})\)（16）\(\frac{5}{9}\div(\frac{5}{18}+\frac{1}{18})\)（17）\((\frac{1}{8}+\frac{7}{8})\times\frac{1}{8}\)（18）\((\frac{4}{11}-\frac{2}{11})\div\frac{1}{11}\)（19）\(\frac{3}{13}\times(\frac{13}{15}+\frac{2}{15})\)（20）\(\frac{5}{14}\div(\frac{1}{2}+\frac{1}{7})\)（21）\((\frac{1}{10}+\frac{9}{10})\times\frac{1}{10}\)（22）\((\frac{2}{15}-\frac{1}{5})\div\frac{3}{2}\)（23）\(\frac{3}{16}\times(\frac{16}{18}-\frac{1}{18})\)（24）\(\frac{5}{17}\div(\frac{5}{34}+\frac{2}{34})\)（25）\((\frac{1}{18}+\frac{17}{18})\times\frac{1}{18}\)（26）\((\frac{4}{19}-\frac{2}{19})\div\frac{1}{19}\)（27）\(\frac{3}{20}\times(\frac{20}{21}-\frac{1}{21})\)（28）\(\frac{5}{22}\div(\frac{1}{2}+\frac{1}{11})\)（29）\((\frac{1}{24}+\frac{23}{24})\times\frac{1}{24}\)（30）\((\frac{2}{25}-\frac{1}{5})\div\frac{5}{2}\)2.含中括號(hào)的混合運(yùn)算（30題）（1）\([\frac{1}{2}+(\frac{1}{3}-\frac{1}{4})]\times\frac{3}{4}\)（2）\([\frac{2}{3}-(\frac{1}{4}\div2)]\times\frac{1}{2}\)（3）\(\frac{3}{5}\div[(\frac{1}{2}+\frac{1}{4})\times\frac{2}{3}]\)（4）\(\frac{4}{7}\times[(\frac{1}{2}-\frac{1}{3})\div\frac{1}{6}]\)（5）\([(\frac{1}{5}+\frac{2}{7})\times35]\div\frac{1}{2}\)（6）\([(\frac{3}{4}-\frac{1}{5})\div\frac{1}{20}]\times\frac{1}{4}\)（7）\(\frac{2}{3}\times[(\frac{3}{4}-\frac{1}{6})\div\frac{1}{2}]\)（8）\(\frac{5}{6}\div[(\frac{5}{7}+\frac{1}{7})\times\frac{7}{8}]\)（9）\([(\frac{1}{4}+\frac{3}{4})\times\frac{1}{2}]\div\frac{1}{2}\)（10）\([(\frac{4}{5}-\frac{2}{5})\div\frac{1}{5}]\times\frac{1}{5}\)（11）\(\frac{3}{7}\times[(\frac{7}{9}+\frac{2}{9})\div\frac{1}{3}]\)（12）\(\frac{5}{8}\div[(\frac{1}{2}-\frac{1}{4})\times\frac{4}{5}]\)（13）\([(\frac{1}{6}+\frac{5}{6})\times\frac{6}{7}]\div\frac{1}{7}\)（14）\([(\frac{2}{3}-\frac{1}{2})\div\frac{3}{4}]\times\frac{1}{2}\)（15）\(\frac{3}{4}\times[(\frac{4}{5}-\frac{1}{5})\div\frac{1}{5}]\)（16）\(\frac{5}{9}\div[(\frac{5}{18}+\frac{1}{18})\times\frac{18}{6}]\)（17）\([(\frac{1}{8}+\frac{7}{8})\times\frac{1}{8}]\div\frac{1}{8}\)（18）\([(\frac{4}{11}-\frac{2}{11})\div\frac{1}{11}]\times\frac{1}{11}\)（19）\(\frac{3}{13}\times[(\frac{13}{15}+\frac{2}{15})\div\frac{1}{3}]\)（20）\(\frac{5}{14}\div[(\frac{1}{2}+\frac{1}{7})\times\frac{14}{9}]\)（21）\([(\frac{1}{10}+\frac{9}{10})\times\frac{1}{10}]\div\frac{1}{10}\)（22）\([(\frac{2}{15}-\frac{1}{5})\div\frac{3}{2}]\times\frac{1}{2}\)（23）\(\frac{3}{16}\times[(\frac{16}{18}-\frac{1}{18})\div\frac{1}{6}]\)（24）\(\frac{5}{17}\div[(\frac{5}{34}+\frac{2}{34})\times\frac{34}{7}]\)（25）\([(\frac{1}{18}+\frac{17}{18})\times\frac{1}{18}]\div\frac{1}{18}\)（26）\([(\frac{4}{19}-\frac{2}{19})\div\frac{1}{19}]\times\frac{1}{19}\)（27）\(\frac{3}{20}\times[(\frac{20}{21}-\frac{1}{21})\div\frac{1}{7}]\)（28）\(\frac{5}{22}\div[(\frac{1}{2}+\frac{1}{11})\times\frac{22}{13}]\)（29）\([(\frac{1}{24}+\frac{23}{24})\times\frac{1}{24}]\div\frac{1}{24}\)（30）\([(\frac{2}{25}-\frac{1}{5})\div\frac{5}{2}]\times\frac{1}{2}\)（二）分?jǐn)?shù)與小數(shù)混合運(yùn)算（50題）1.小數(shù)化分?jǐn)?shù)的混合運(yùn)算（25題）（1）\(0.5+\frac{1}{3}-\frac{1}{4}\)（2）\(0.25\times\frac{3}{4}\div\frac{1}{2}\)（3）\(0.6-\frac{1}{5}+\frac{2}{3}\)（4）\(0.75\div\frac{3}{4}+\frac{1}{2}\)（5）\(0.4+\frac{2}{5}\times\frac{5}{6}\)（6）\(0.8-\frac{1}{3}\div\frac{1}{2}\)（7）\(0.25\times\frac{3}{4}+\frac{1}{6}\)（8）\(0.5\div\frac{5}{7}-\frac{1}{7}\)（9）\(0.1+\frac{3}{4}\div3\)（10）\(0.6-\frac{2}{5}\times\frac{5}{8}\)（11）\(0.3\times\frac{7}{9}+\frac{1}{3}\)（12）\(0.75\div\frac{1}{2}-\frac{1}{4}\)（13）\(0.125+\frac{5}{6}\times\frac{6}{7}\)（14）\(0.666\cdots-\frac{1}{2}\div\frac{3}{4}\)（提示：\(0.666\cdots=\frac{2}{3}\)）（15）\(0.2+\frac{3}{4}\times\frac{4}{5}\)（16）\(0.875\div\frac{5}{14}-\frac{2}{3}\)（提示：\(0.875=\frac{7}{8}\)）（17）\(0.05+\frac{9}{10}\div3\)（18）\(0.4-\frac{2}{11}\times\frac{11}{12}\)（19）\(0.15\times\frac{13}{15}+\frac{1}{5}\)（20）\(0.35\div\frac{1}{2}-\frac{1}{7}\)（提示：\(0.35=\frac{7}{20}\)）（21）\(0.0625+\frac{11}{12}\times\frac{12}{13}\)（提示：\(0.0625=\frac{1}{16}\)）（22）\(0.2-\frac{1}{5}\div\frac{3}{2}\)（23）\(0.1875\times\frac{16}{18}+\frac{1}{6}\)（提示：\(0.1875=\frac{3}{16}\)）（24）\(0.2941\cdots\div\frac{5}{34}-\frac{2}{3}\)（提示：\(0.2941\cdots=\frac{5}{17}\)）（25）\(0.____\cdots+\frac{17}{18}\div17\)（提示：\(0.____\cdots=\frac{1}{24}\)）2.分?jǐn)?shù)化小數(shù)的混合運(yùn)算（25題）（1）\(\frac{1}{2}+0.3-\frac{1}{4}\)（2）\(\frac{2}{3}\times0.6\div\frac{1}{5}\)（3）\(\frac{3}{4}-0.25+\frac{1}{3}\)（4）\(\frac{4}{5}\div0.8+\frac{1}{2}\)（5）\(\frac{1}{5}+0.4\times\frac{5}{6}\)（6）\(\frac{3}{7}-0.5\div\frac{1}{2}\)（7）\(\frac{2}{9}\times0.9+\frac{1}{6}\)（8）\(\frac{5}{8}\div0.625-\frac{1}{7}\)（9）\(\frac{1}{10}+0.75\div3\)（10）\(\frac{3}{10}-0.4\times\frac{5}{8}\)（11）\(\frac{3}{8}\times0.8+\frac{1}{3}\)（12）\(\frac{5}{12}\div0.5-\frac{1}{4}\)（13）\(\frac{1}{12}+0.833\cdots\times\frac{6}{7}\)（提示：\(0.833\cdots=\frac{5}{6}\)）（14）\(\frac{2}{7}-0.333\cdots\div\frac{3}{4}\)（提示：\(0.333\cdots=\frac{1}{3}\)）（15）\(\frac{3}{20}+0.8\times\frac{4}{5}\)（16）\(\frac{7}{8}\div0.875-\frac{2}{3}\)（17）\(\frac{1}{16}+0.9\div3\)（18）\(\frac{4}{11}-0.2\times\frac{11}{12}\)（19）\(\frac{3}{26}\times0.5+\frac{1}{5}\)（20）\(\frac{5}{14}\div0.5-\frac{1}{14}\)（21）\(\frac{1}{24}+0.____\cdots\times\frac{24}{25}\)（提示：\(0.____\cdots=\frac{23}{24}\)）（22）\(\frac{2}{25}-0.2\div\frac{5}{2}\)（23）\(\frac{3}{27}\times0.9+\frac{1}{9}\)（24）\(\frac{5}{28}\div0.5-\frac{1}{14}\)（25）\(\frac{1}{30}+0.____\cdots\div3\)（提示：\(0.____\cdots=\frac{29}{30}\)）（三）分?jǐn)?shù)簡(jiǎn)便運(yùn)算（運(yùn)算定律應(yīng)用）（50題）1.乘法交換律與結(jié)合律（20題）（1）\(\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}\)（2）\(\frac{3}{5}\times\frac{5}{6}\times\frac{6}{7}\)（3）\(\frac{1}{2}\times\frac{4}{3}\times\frac{3}{2}\)（4）\(\frac{4}{7}\times\frac{7}{8}\times\frac{8}{9}\)（5）\(\frac{5}{9}\times\frac{9}{10}\times\frac{10}{11}\)（6）\(\frac{1}{3}\times\frac{3}{5}\times\frac{5}{7}\)（7）\(\frac{2}{5}\times\frac{5}{7}\times\frac{7}{9}\)（8）\(\frac{3}{7}\times\frac{7}{10}\times\frac{10}{13}\)（9）\(\frac{4}{9}\times\frac{9}{13}\times\frac{13}{17}\)（10）\(\frac{5}{11}\times\frac{11}{16}\times\frac{16}{21}\)（11）\(\frac{1}{4}\times\frac{4}{9}\times\frac{9}{16}\)（12）\(\frac{2}{7}\times\frac{7}{12}\times\frac{12}{25}\)（13）\(\frac{3}{8}\times\frac{8}{15}\times\frac{15}{32}\)（14）\(\frac{4}{9}\times\frac{9}{20}\times\frac{20}{49}\)（15）\(\frac{5}{10}\times\frac{10}{21}\times\frac{21}{50}\)（16）\(\frac{1}{5}\times\frac{5}{12}\times\frac{12}{61}\)（17）\(\frac{2}{6}\times\frac{6}{13}\times\frac{13}{71}\)（18）\(\frac{3}{7}\times\frac{7}{14}\times\frac{14}{81}\)（19）\(\frac{4}{8}\times\frac{8}{15}\times\frac{15}{91}\)（20）\(\frac{5}{9}\times\frac{9}{16}\times\frac{16}{101}\)2.乘法分配律（30題）（1）\((\frac{1}{2}+\frac{1}{3})\times6\)（2）\((\frac{2}{3}-\frac{1}{4})\times12\)（3）\(\frac{3}{5}\times(1+\frac{2}{3})\)（4）\(\frac{4}{7}\times(\frac{7}{8}-\frac{1}{2})\)（5）\((\frac{1}{5}+\frac{2}{7})\times35\)（6）\((\frac{3}{4}-\frac{1}{5})\times20\)（7）\(\frac{2}{3}\times\frac{3}{4}+\frac{2}{3}\tim