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脱式计算,(能简算的简算) 201×0.65%0.65 3...

(1)0.8×(3.2-2.3÷2.3),=0.8×(3.2-1),=0.8×2.2,=1.76;(2)3.65×4.7-36.5×0.47,=36.5×0.47-36.5×0.47,=0.

①2.07÷2.5÷0.4,=2.07÷(2.5×0.4),=2.07÷1,=2.07;②21.36÷0.8-12.9,=26.7-12.9,=13.8;③0.125×32×2.5,=0.125×8×4×2.5,=(0.125×8)×(4×2.5),=1×10,=10;④0.65×201,=0.65×(200+1),=0.65×200+0.65×1,=130+0.65,=130.65;⑤1.2×2.5...

1、①6.54×1.2-1.87 =7.848-1.87 =5.978; ②86.4÷0.24+40 =360+40 =400; ③0.46×1.9+0.54×1.9 =1.9×(0.46+0.54) =1.9×1 =1.9; ④13.65÷0.25÷4 =13.65÷(0.25×4) =13.65÷1 =13.65. 2、其中③ ④可以用简便方法。 3、③的简便方法:乘法分配率:(...

(1)615×17+815÷7,=615×17+815×17,=(615+815)×17,=1415×17,=215;(2)910÷[12×(65?310)],=910÷[12×910],=910÷920,=2;(3)8.6×234-0.6÷411,=8.6×114-0.6×114,=(8.6-0.6)×114,=8×114,=22.

①62.4×15-66.95÷65 =936-1.03=934.97; ②12.5×25×0.32=(12.5×0.8)×(25×0.4)=10×10=100; ③5.8×2.8+2.8+3.2×2.8=2.8×(5.8+1+3.2)=2.8×10=28.

(1)20.9+10.5÷(5.2-3.5)=20.9+10.5÷1.7=20.9+6317=2713170;(2)3.5×0.7+5.5×0.7+0.7=(3.5+5.5+1)×0.7=10×0.7=7;(3)10.64+7.65×2.4+11.76=10.64+18.36+11.76=29+11.76=40.76;(4)6.2×9.9=6.2×(10-0.1)=6.2×10-6.2×0.1=62-0.62=61....

0.65除以1.3加3.6除以0.04脱式计算 =0.5+90 =90.5 没有合适的简便方法

(1)5.45+0.56×7.4,=5.45+4.144,=9.594;(2)2.5×0.89×4,=(2.5×4)×0.89,=10×0.89,=8.9;(3)25×16.7-25×0.7,=25×(16.7-0.7),=25×16,=400;(4)7.6×99,=7.6×(100-1),=7.6×100-7.6,=760-7.6,=752.4;(5)5.6×10.2,=5.6×...

1.42×0.65-0.47脱式计算 1.42×0.65-0.47 =0.923-0.47 =0.453

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