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一点六乘七点五乘一点二五用脱式计算你认为怎样简...

原式 =1.6x7.5x1.25 =0.2x8x7.5x1.25 =(0.2x7.5)x(8x1.25) =1.5x10 =15

原式=7×0.8×0.125 =7×(0.8×0.125) =7×0.1 =0.7

(5/9+3/4+7/12)×36 =5/9×36+3/4×36+7/12×36 =20+27+21 =68 56×4/57 =(57-1)×4/57 =57×4/57-4/57 =4-4/57 =3又53/57

2.6+2.4x0.5 =2.6+1.2 =3.8

2-6分之5乘20%用脱式计算 =2-5/6x1/5 =2-1/6 =1又5/6

15.52-(1+0.6)(5+0.7) =15.52-5-0.7-3-0.42 =7.52-1.12 =6.4

56x0.125 =(7x8)x0.125 =7x(8x0.125) =7x1 =7 希望能帮到你!

65x23/64 =(64+1)x23/64 =64x23/64+1x23/64 =23+23/64 =23又23/64

5/6×5/6 =(5×5)/(6×6) =25/36

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