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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)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...

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

3.9÷0.65÷2 =3.9÷(0.65×2) =3.9÷1.3 =3

(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;...

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.

5.8x3.1-7.65 =5.8x(3+0.1)-7.65 =17.4+0.58-7.65 =17.98-7.65 =10.33

0.65x98 =0.65×(100-2) =0.65×100-0.65×2 =65-1.3 =63.7

直接算

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