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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...

0.65×2.4-0.65×1.4 =0.65x(2.4-1.4) =0.65x1 =0.65

3.9÷0.65÷2 =3.9÷(0.65×2) =3.9÷1.3 =3

1.4*2.15-1.95除0.65 =3.01-1.95除0.65 =1.06除0.65 =1.63076923

5.65 解析: 8.5×5.65-7.5×5.65 =(8.5-7.5)×5.65 =1×5.65 =5.65

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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

原式等于 65÷(2.5×0.08) =65÷0.2 =325 所以原式的计算结果为325.

口算题17×40= 100-63= 3.2+1.68= 2.8×0.4= 14-7.4= 1.92÷0.04= 0.32×500= 0.65+4.35= 10-5.4= 4÷20= 3.5×200= 1.5-0.06= 0.75÷15= 0.4×0.8= 4×0.25= 0.36+1.54= 1.01×99= 420÷35= 25×12= 135÷0.5= 3/4 + 1/4 = 2 + 4...

2.4/0.65 6.5/0.76 脱式计算 2.4/0.65 6.5/0.76 =0.65*(0.24+0.76) =0.65*1 =0.65

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