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脱式计算,(能简算的简算) 201×0.65%0.65 3...

(1)201×0.65-0.65,=(201-1)×0.65,=200×0.65,=130;(2)3.6×0.7×2.5,=4×0.9×0.7×2.5,=(0.9×0.7)×(2.5×4),=0.63×10,=6.3;(3)6.44×3.7+6.44×6.3,=6.44×(3.7+6.3),=6.44×10,=64.4;(4)1.25×39.5×0.8,=(1.25×0.8)×39.5...

(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.

(1)7.6×40.3÷(76×0.8)÷1.25,=7.6×40.3÷76÷0.8÷1.25,=7.6÷76÷(0.8×1.25)×40.3,=0.1×40.3,=4.03;(2) 5 1 5 ÷0.65- 1 5 7 ×0.875,=5.2÷0.65- 12 7 × 7 8 ,=8- 3 2 ,= 13 2 ;(3)(8.6- 7 4 7 )÷ 2 6 7 +7.64,=(8 3 5 - 7 4 7...

(1)8.65-3.7+1.35-6.3=(8.65+1.35)-(3.7+6.3),=10-10,=0; (2)[2.1+3.61÷(7.2-5.3)]×30=[2.1+3.61÷1.9]×30,=[2.1+1.9]×30,=4×30,=120;(3)1.2+36÷[1.44×(0.1-0.05)]=1.2+36÷[1.44×0.05],=1.2+36÷0.072,=1.2+500,=501.2;...

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....

3.9÷0.65÷2 =3.9÷(0.65×2) =3.9÷1.3 =3

(1)2.65×1.7+1.35×1.7,=(2.65+1.35)×1.7,=4×1.7,=6.8;(2)23.4÷7.8-2.1,=3-2.1,=0.9;(3)0.75×18÷0.15,=0.75÷0.15×18,=5×18,=90;(4)2.5×3.2×1.25,=2.5×4×0.8×1.25,=(2.5×4)×(0.8×1.25),=10×1,=10.

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.

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

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