小数简便算1(精品文档)

156.5－21.7－3.3－6.5=156.5—6.5－（21.7+3.3）36.8－8.21+2.21=36.8－（8.21－2.21）10.1×56

=36.8－6=30.8=15102－.52×5

32×2.5=1254.5×45＋4.5×54＋4.512.5×0.32×2.5=12.5×4×8×2.5=(12.5×8)

×(4×2.5)=100×10=1000=(10+0.1)

×56=56×10+56×0.1=560+5.6=565.6=4.5×(45+54+1)=4.5×100=450=12.5×0.4×0.8×2.5=(12.5×0.8)

×(0.4×2.5)=10×1=109.98×6.2=(10－0.02)

×6.212.5×8.082.5×（33×44）=1（2.05.×138+×0.1.30+10.13+0.13）×0.25=100×1.01=6.2×10－6.2×0.020.32×45＋0.32×54＋0.32=0.32×(45+54+1)=0.32×100=62－0.124=61.876=320=101=2.5×44×33=2.5×(40+4)

×33=(2.5×40+2.5×4)

×33=(100+10)

×33=100×33+10×33=3300+330=3630=0.13×4×0.25=0.13×(4×0.25)=0.13×1=0.139.9×9.9+0.99（0.125+0.25）×0.8=0.125×0.8+0.25×0.8=9.09.×271×0

45+2.7×5.5=9965×9.9+6.5=2.7×4.5+2.7×5.52.5×1.3×0.4=2.7×(4.5+5.5)=65×9.9+65×0.10.25×0.32×1.25=65×(9.9+0.1)=9.9×9.9+9.9×0.1=9.9×(9.9+0.1)=0.1+0.2=0.3=2.7×10=270=65×10=650=2.5×0.4×1.3=1×1.3=1.3=0.25×0.4×0.8×1.25=(0.25×0.4)

×(0.8×1.25)=0.1×1=0.1（2.5+0.25）×0.40.98×1.0212.5×80.8

4.6×4.6+6.4×4.6－4.6=2.5×0.4+0.25×0.4=1+0.1=1.1=0.98×(1+0.02)=0.98×1+0.98×0.02=0.98+0.0196=0.9996=12.5×8×10.1=100×10.1=1010=4.6×(4.6+6.4－1)=4.6×10=4601.3×2.5+0.13×759.9×9.9+0.99=1.3×(2.5+7.5)7.23×9.8=1.3×10=136.46×7.7+12.3×6.468.08×12.5=7.23×(10－0.2)=7.23×10－7.23×0.2=72.3－1.446=70.85416.4÷0.25=1.3×2.5+1.3×7.5=9.9×9.9+9.9×0.1=9.9×(9.9+0.1)=9.9×10=99=1.01×8×12.5=1.01×(8×12.5)=1.01×100=101=(16.4×4)

÷(0.25×4)=65.6÷1=65.612÷0.257.14－3.95+2.86－1.05=(12×4)

÷(0.25×4)=48÷1=489.9×101－9.9=(7.14+2.86)

－(3.95+1.05)=10－5=5100÷0.25×0.87.6×8.1+0.19×761.6×3.7×1.25=9.9×(101－1)=9.9×100=990=400×0.8=320=7.6×8.1+1.9×7.6=7.6×(8.1+1.9)=7.6×10=76=2×0.8×3.7×1.25=(2×3.7)

×(0.8×1.25)=7.4×1=7.40.125×25×1.65.9×1.6+5.9×0.470÷1.25=(10－0.1)

×2.845.55－（6.82+15.55）=0.125×25×0.2×8=(0.125×8)

×(25×0.2)=1×5=59.9×2.8

（6.78+6.78÷6.78－6.78）×6.7=811.8=5.9×(1.6+0.4)=5.9×2=10×2.8－0.1×2.8=28－0.28=27.72=(6.78+1－6.78)

×6.78=1×6.78=6.78=(70×0.8)

÷(1.25×0.8)=56÷1=56=45.55－15.55－6.82=30－6.82=23.181.08×1252.18÷2.5÷0.4=1.01×8×125=1.0.18×(98.×6+1925×)

0.96=1.01×1000=10101.7÷0.4÷0.25=10.8×9.6+9.2×9.6=9.6×(10.8+9.2)=9.6×20=1923.8×0.25÷0.387.1÷（0.25×0.71）=2.18÷(2.5×0.4)=2.18÷1=2.18=1.7÷(0.4×0.25)=1.7÷0.1=17=3.8÷0.38×0.25=10×0.25=2.5=7.1÷0.71÷0.25=10÷0.25=4018.4－2.7－7.3－2.4=(18.4－2.4)

－(2.7+7.3)17.2－2.2+3.3－3.8=16－10=6

.4－6.4×0.56－6.4×0.349.98×3.74.7×0.9+0.47

3.54×7.7+3.3×3.54－3.54=17.2+3.3－(2.2+3.8)=20.5－6=14.5=6.4－6.4×(0.56+0.34)=6.4－6.4×0.9=6.4×(1－0.9)=6.4×0.1=0.64=(10－0.02)

×3.7=10×3.7－0.02×3.7=37－0.074=36.926=4.7×0.9+4.7×0.1=4.7×(0.9+0.1)=4.7×1=4.7=3.54×(7.7+3.3－1)=3.54×10=35.415÷1.2513.2－4.6+6.8－5.4=9÷121.5×8.08=94.31×0.995.9×59+5.9×36+5×5.9=12.5×8×1.08=100×1.08=10881.3－2.38－7.62=(15×0.8)÷(1.25×0.8)=(13.2+6.8)

－(4.6+5.4)=20－10=10=4.31×(1－0.01)=4.31×1－4.31×0.01=4.31－0.0431=4.2669=5.9×(59+36+5)=5.9×100=590=81.23－(2.38+7.62)=81.23－10=71.232.74×6.5－2.74+4.5×2.741.2÷1.25=（2.37.41+×31.01+3.1+3.1）×2.5=27.47.4－7.4×0.7－7.4×0.2=3.1×4×2.5=3.1×(4×2.5)=3.1×10=312.5×4.04=2.74×(6.5－1+4.5)=(1.2×0.8)

÷(1.25×0.8)=0.96÷1=0.96=7.4×(1－0.7－0.2)=7.4×0.1=0.74=2.5×4×1.01=10×1.01=10.11.25×3.2×0.25=1(.25×0.8×4×0).25(7.92+3.08－3.54－6.45=1×7.1

3×0.5+7.13+8.5×7.13=19.9×2.8+2=81×1－0.90.199=1.01)=11－(3.54+6.45)=7.13×(0.5+1+8.5)=7.13×10=71.38.8×1