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1.25×0.25×8×40用简便方法计算 5.7×9.9 0.34×10.1

1.25×0.25×8×40 =(1.25×8)×(0.25×40) =10×10 =100 5.7×9.9 =5.7×(10-0.1) =5.7×10-5.7×0.1 =57-0.57 =56.43 0.34×10.1 =0.34×(10+0.1) =0.34×10+0.34×0.1 =3.4+0.034 =3.434 12.5×(10+0.8) =12.5×10+12.5×0.8 =125+10 =135 44.5×3.7+6.3×44.5 =4...

①12.8+ 7 20 +7.2+ 1 10 =(12.8+7.2)+( 7 20 + 1 10 ),=20+ 9 20 ,= 20 9 20 ;②9.9×35=(10-0.1)×35,=10×35-0.1×35,=350-3.5,=346.5;③10- 5 8 - 11 8 =10-( 5 8 + 11 8 ),=10-2,=8;④12.5×5×16=(12.5×8)×(5×2),=100×10,=...

1.9×25+10.5×5 =1.9x5x5+10.5x5 =5x(1.9x5+10.5) =5x(9.5+10.5) =5x20 =100

26.9×10.1-1.25×26.9×0.8=26.9×(10.1-1.25×0.8)=26.9×10+26.9×0.1-26.9=269+2.69-26.9=244.79

5/8+7/9+3/8 =5/8+3/8+7/9 =1+7/9 =1又7/9 25/18--2/5--3/5 =25/18-(2/5+3/5) =25/18-1 =7/18 5/9--5/12+4/9 =5/9+4/9-5/12 =1-5/12 =7/12 2/3+7/10+1/3+3/10 =2/3+1/3+(7/10+3/10) =1+1 =2 8/9--(1/5--1/9) =8/9+1/9-1/5 =1-1/5 =4/5 5/12+...

10.1x8.9 =(10+0.1)x8.9 =10x8.9+0.1x8.9 =89+0.89 =89.89

(1)原式=16.8-6.8×0.25 =16.8-1.7 =15.1 (2)原式=0.25×40×6.5 =10×6.5 =65 (3)原式=0.25×4×(8×1.25) =1×10 =10 (4)原式= 4.672+9.36 =14.032 (5)原式=(10+0.1)×0.99 =9.9+0.099 =9.999 (6)原式= 4.66×(0.28+0.82-1) = 4.66×0...

(1)0.8×3.9×1.25=0.8×1.25×3.9=1×3.9=3.9;(2)3.6×10.1=3.6×(10+0.1)=3.6×10+3.6×0.1=36+0.36=36.36;(3)4.8×1.25=6×0.8×1.25=6×(0.8×1.25)=6×1=6;(4)4.87×2.34+48.7×0.266=4.87×2.34+4.87×2.66=4.87×(2.34+2.66)=4.87×5=24.35.

原式=9.9×2.8+2.8×0.1=2.8×(9.9+0.1)=2.8×10=28 原式=1.1×(10+0.1)=1.1×10+1.1×0.1=11+0.11=11.11

1+2+3+4+5+6+7+8+9+10+…+100=100×(100+1)2=50×101=5050.

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