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7又1/2:1.2=2.5/x等式计算

7又1/2:1.2=2.5/x等式计算 解: 7又1/2:1.2=2.5/x 7.5x=1.2*2.5 7.5x=3 x=0.4

1.7X2.5十2.3X2.5 =2.5×(1.7+2.3) =2.5×4 =10

2.5x-3.7=11.1-1.2x求解方程 解2.5x十1.2x二11.1+3.7 3.7x二14.8 x=4

题目有错。请仔细检查。正确的应该是 1.25x0·7十1·25x1.2十0.125 =1.25×0.7+1.25×1.2+1.25×0.1 =1.25×(0.7+1.2+0.1) =1.25×2 =2.5

2.5*4*0.3*9.9=10*9.9*0.3=99*0.3=29.7

2.5X=5又1/2+8又7分之4 2.5X=14又14分之1 X=5又35分之22。

(2.5x十1÷2)x(6一x)=7 (5x+1)(6-x)=14

(5.7x1.2+1.2x4.3)×2.5的简便计算 =(5.7+4.3)x1.2x2.5 =10x1.2x2.5 =12x2.5 =30

原式=2.5x(8-0.1)x1.2 =(2.5x8-2.5x0.1)x1.2 =(20-0.25)x1.2 =20x1.2-0.25x1.2 =24-0.25x4x0.3 =24-0.3 =23.7

2.5x+4.3=3.2x+1.2 2.5x-3.2x=1.2-4.3 -0.7x=-3.1 x=3.1/0.7 x=31/7

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