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(8点25一3点75)除以2点5除以4的简便方法计算

4÷1.25÷8 =4÷(1.25×8) =4÷10 =0.4

原式=9/4*36/5+14/5 / 4/9 =81/5+14/5*9/4 =81/5+63/10 =162/10+60/10 =222/10 =22.2

(6.9×0.1.25×1.75)÷(2.3×1/8×1/4) = 6.9×0.1.25×1.75÷2.3÷1/8÷1/4 = 6.9×0.1.25×1.75÷2.3×8×4 = (6.9÷2.3)×(0.1.25×8)×(1.75×4) = 3×1×7 = 21

1又1/8×728+27.2×11.25×5×1/5 =1.125×728+27.2×11.25×(5×1/5) =11.25×72.8+27.2×11.25 =11.25×(72.8+27.2) =11.25×100 =1125

用简便方法计算 1.8×25+24÷1.5 =45+16 =61

6.8×25分之8+0.32×4.2-8÷25-1 =6.8×0.32+0.32×4.2-0.32-1 =0.32×(6.8+4.2-1)-1 =0.32×10-1 =3.2-1 =2.2

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(1又3/4-7/8-7/12)×1/7 =7/4×1/7-7/8×1/7-7/12×1/7 =1/4-1/8-1/12 =3/12-1/12-1/8 =1/6-1/8 =1/24

33.8÷0.13-5.9×25 =3380÷13-(6-0.1)×25 =260-6×25+0.1×25 =260-150+2.5 =112.5

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