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7.5x一7.5x0.9,0.65

7.5-7.5x0.9 =7.5×(1-0.9) =7.5×0.1 =0.75

原式 =7.5x1-7.5x0.9 =7.5x(1-0.9) =7.5x0.1 =0.75

10.5x-7.5x=0.9 3x=0.9 x=0.3

3x=0.9 x=0.9÷3 x=03

(10.5﹣7.5)x=0.9 3x=0.9 x=0.3

7.5+2.5x3.6简便计算 =7.5+2.5x4x0.9 =7.5+10x0.9 =7.5+9 =16.9

7.5÷ =0.9 x-5=7.5÷0.9 x-5=25/3 x=5+25/3 x=40/3

2.3x+1.7x=8.44 4x=8.44 x=2.11 0.9x-0.4x=20 0.5x=20 x=40 7.5x-7x=12.5 0.5x=12.5 x=25 7x-2x=155 5x=155 x=31 3.5x+2x=16.5 5.5x=16.5 x=3

首先计算7.5*1.4=15*0.7=10.5 10.5*0.9=9.45 也就是利用乘法交换律和结合律进行简化运算。

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