五年級(jí)上冊(cè)數(shù)學(xué)小數(shù)乘除法簡(jiǎn)便計(jì)算專(zhuān)項(xiàng)練習(xí)（必考題型，要求掌握）1、計(jì)算下面各題，能簡(jiǎn)便計(jì)算的要簡(jiǎn)算。0.84×13.5÷0.16=11.34÷0.16=70.87596.5÷5÷0.2=96.5÷(5×0.2)=96.5÷1=96.51.25×88=1.25×(80+8)=1.25×80+1.25×8=100+10=1107.8+2.2×5.54=7.8+12.188=19.9884.5×2.74-0.74×4.5=4.5×(2.74-0.74)=4.5×2=94.92÷(4.92×4)=4.92÷4.92÷4=1÷4=0.252、計(jì)算下面各題，能簡(jiǎn)便計(jì)算的要簡(jiǎn)算。1.25×4.6×8=(1.25×8)×4.6=10×4.6=461.5×99=1.5×(100-1)=1.5×100-1.5×1=150-1.5=148.512.7÷(12.7×5)=12.7÷12.7÷5=1÷5=0.256×1.25=7×8×1.25=7×(8×1.25)=7×10=7071.8÷0.25÷4=71.8÷(0.25×4)=71.8÷1=71.81.6×3.5÷0.8=1.6÷0.8×3.5=2×3.5=73、計(jì)算下面各題，能簡(jiǎn)便計(jì)算的要簡(jiǎn)算。2.4+1.8+3.6+2.2=(2.4+3.6)+(1.8+2.2)=6+4=100.25×3.2×12.5=0.25×4×0.8×12.5=(0.25×4)×(0.8×12.5)=1×10=1010.6×55.4-55.4×0.6=(10.6-0.6)×55.4=10×55.4=55412÷3.75+1.92=3.2+1.92=5.129.5×101=9.5×(100+1)=9.5×100+9.5×1=950+9.5=959.52.1×4.6÷0.35=9.66÷0.35=27.64、計(jì)算下面各題，能簡(jiǎn)便計(jì)算的要簡(jiǎn)算。9.9×13.6=(10-0.1)×13.6=10×13.6-0.1×13.6=136-1.36=134.646.59×2.45+7.55×6.59=6.59×(2.45+7.55)=6.59×10=65.94.2×1.01=4.2×(1+0.01)=4.2×1+4.2×0.01=4.2+0.042=4.24245×2.1-5×2.1=(45-5)×2.1=40×2.1=844.78×99+4.78=4.78×99+4.78×1=4.78×(99+1)=4.78×100=47818.8×101-18.8=18.8×101-18.8×1=18.8×(101-1)=18.8×100=18805、計(jì)算下面各題，能簡(jiǎn)算的要簡(jiǎn)算。(1.8+1.8+1.8+1.8)×2.5=1.8×4×2.5=1.8×(4×2.5)=1.8×10=187.5×(0.14+1.06)=7.5×1.2=99.08-22.78÷3.4=9.08-6.7=2.380.56×0.36+0.44×0.36=0.36×(0.56+0.44)=0.36×1=0.3614.7÷(0.14×2.5)=14.7÷0.35=429.52+0.48÷0.2=9.52+2.4=11.926、計(jì)算下面各題，能簡(jiǎn)便計(jì)算的要簡(jiǎn)算。1.25×3.2×2.5=1.25×(8×0.4)×2.5=(1.25×8)×(0.4×2.5)=10×1=104.64+3.7×2.8=4.64+10.36=1535.6-5.6×1.7=35.6-9.52=26.084.5×10.1=4.5×(10+0.1)=4.5×10+4.5×0.1=45+0.45=45.4513÷0.4÷2.5=13÷(0.4×2.5)=137.8÷2.6+2.7×1.5=3+4.05=7.057、計(jì)算下面各題，能簡(jiǎn)便計(jì)算的要簡(jiǎn)算。3.89÷2.5÷0.4=3.89÷(2.5×0.4)=3.89÷1=3.892.5×4.7+25×0.53=2.5×4.7+2.5×5.3=2.5×(4.7+5.3)=2.5×10=250.85+0.15÷3=0.85+0.05=0.912.5×3.2×2.5=12.5×0.8×4×2.5=(12.5×0.8)×(4×2.5)=1000.34×99=0.34×(100-1)=0.34×100-0.34×1=34-0.34=33.660.5+4.5÷1.5=0.5+3=3.58、計(jì)算下面各題，能簡(jiǎn)便計(jì)算的要簡(jiǎn)算。1.25×3.2×2.5=1.25×(8×0.4)×2.5=(1.25×8)×(0.4×2.5)=10×1=108.4×2.4+2.4×1.6=2.4×(8.4+1.6)=2.4×10=248.3-2.76×1.5=8.3-4.14=4.162.5×10.2=2.5×(10+0.2)=2.5×10+2.5×0.2=25+0.5=25.519.28×101-19.28=19.28×(101-1)=19.28×100=192832.4÷2.5÷0.4=32.4÷(2.5×0.4)=32.4÷1=32.49.計(jì)算下面各題，能簡(jiǎn)算的要簡(jiǎn)算。0.25×1.56×4=0.25×4×1.56=1×1.56=1.560.74×99+0.74=0.74×99+0.74×1=0.74×(99+1)=747.5÷1.5×1.3=5×1.3=6.52.74÷0.125÷8=2.74÷(0.125×8)=2.74÷1=2.7412.5×7.2=12.5×8×0.9=100×0.9=9027.3÷[(7.4-6.8)×1.3]=27.3÷[0.6×1.3]=27.3÷0.78=3510.計(jì)算下面各題，能簡(jiǎn)算的要簡(jiǎn)算。0.56×102-0.2×5.6=0.56×102-2×0.56=0.56×(102-2)=0.56×100=5610.1×8.3=(10+0.1)×8.3=10×8.3+0.1×8.3=83+0.83=83.8310.2÷34×120=0.3×1