五年級(jí)數(shù)學(xué)暑假作業(yè)：簡(jiǎn)便計(jì)算練習(xí)題2.5×2.4×0.7＝2.5×（4×0.6）×0.7＝（2.5×4）×（0.6×0.7）＝10×0.42＝4.20.46＋4.6×9.9＝4.6×0.1＋4.6×9.9＝4.6×（0.1＋9.9）＝4.6×10＝461.08×0.9÷0.27＝1.08÷0.27×0.9＝4×0.9＝3.63.72×2.5×0.4＝3.72×（2.5×0.4）＝3.72×1＝3.728.3×99＋8.4＝8.3×（100－1）＋8.4＝8.3×100－8.3＋8.4＝830＋（8.4－8.3）＝830＋0.1＝830.11.25×0.25×32＝1.25×0.25×（4×8）＝1.25×0.25×4×8＝1.25×8×4×0.25＝（1.25×8）×（4×0.25）＝10×1＝102.07×4.9－2.07×1.9＝2.07×（4.9－1.9）＝2.07×3＝6.216.1×3.6＋3.6×3.9＝（6.1＋3.9）×3.6＝10×3.6＝36五年級(jí)數(shù)學(xué)暑假作業(yè)：簡(jiǎn)便計(jì)算練習(xí)題0.125×5.6＝0.125×（8×0.7）＝0.125×8×0.7＝1×0.7＝0.73.44×7.9＋0.344×21＝3.44×7.9＋3.44×2.1＝3.44×（7.9＋2.1）＝3.44×10＝34.40.78×98＝0.78×（100－2）＝0.78×100－0.78×2＝78－1.56＝76.444.75×99＋4.75＝4.75×99＋4.75×1＝4.75×（99＋1）＝4.75×100＝47535.97－（4.86＋5.97）＝35.97－4.86－5.97＝35.97－5.97－4.86＝30－4.86＝25.1456×1.25＝8×7×1.25＝7×（8×1.25）＝7×10＝709.2×2.7＋0.8×2.7＝（9.2＋0.8）×2.7＝10×2.7＝275.97÷0.25÷4＝5.97÷（0.25×4）＝5.97÷1＝5.97五年級(jí)數(shù)學(xué)暑假作業(yè)：簡(jiǎn)便計(jì)算練習(xí)題101×0.45＝（100＋1）×0.45＝100×0.45＋0.45＝45＋0.45＝45.4512.5×3.2×2.5＝12.5×（0.8×4）×2.5＝（12.5×0.8）×（4×2.5）＝10×10＝10024.7÷0.8÷1.25＝24.7÷（0.8×1.25）＝24.7÷1＝24.710.5×28.3＋10.5×71.7＝10.5×（28.3＋71.7）＝10.5×100＝10500.72×99＝0.72×（100－1）＝0.72×100－0.72＝72－0.72＝71.280.25×3.2×12.5＝0.25×4×0.8×12.5＝（0.25×4）×（0.8×12.5）＝1×10＝100.25×160×1.25＝0.25×（20×8）×1.25＝（0.25×20）×（8×1.25）＝5×10＝506.46×3.5＋3.5×4.54－3.5＝3.5×（6.46＋4.54－1）＝3.5×（11－1）＝3.5×10＝35五年級(jí)數(shù)學(xué)暑假作業(yè)：簡(jiǎn)便計(jì)算練習(xí)題29.6÷0.4÷2.5＝29.6÷（0.4×2.5）＝29.6÷1＝29.698×5.98＋2×5.98＝（98＋2）×5.98＝100×5.98＝59841.7÷2.5÷4＝41.7÷（2.5×4）＝41.7÷10＝4.174.7×5.8＋5.3×5.8＝5.8×（4.7＋5.3）＝5.8×10＝584.8×56.7＋0.567×520＝4.8×56.7＋56.7×5.2＝（4.8＋5.2）×56.7＝10×56.7＝5674.7×9.9＝4.7×（10－0.1）＝4.7×10－4.7×0.1＝47－0.47＝46.5343.5×101＝43.5×（