x-0.65x=3.5 3(x-8/5)=1.2 (x-1/4)÷9=8 (x-20.9)÷3=7.3 0.85×5+5x=5 4/5÷x=8/9 31-x=7.2 解方程..求5(x-7.4)=42.5 5x+2.5×5=30

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x-0.65x=3.53(x-8/5)=1.2(x-1/4)÷9=8(x-20.9)÷3=7.30.85×5+5x=54/5÷x=8/931-x=7.2解方程..求5(x-7.4)=42.55x+2.

x-0.65x=3.5 3(x-8/5)=1.2 (x-1/4)÷9=8 (x-20.9)÷3=7.3 0.85×5+5x=5 4/5÷x=8/9 31-x=7.2 解方程..求5(x-7.4)=42.5 5x+2.5×5=30
x-0.65x=3.5 3(x-8/5)=1.2 (x-1/4)÷9=8 (x-20.9)÷3=7.3 0.85×5+5x=5 4/5÷x=8/9 31-x=7.2 解方程..求
5(x-7.4)=42.5 5x+2.5×5=30

x-0.65x=3.5 3(x-8/5)=1.2 (x-1/4)÷9=8 (x-20.9)÷3=7.3 0.85×5+5x=5 4/5÷x=8/9 31-x=7.2 解方程..求5(x-7.4)=42.5 5x+2.5×5=30
5(x-7.4)=42.5
x-7.4=42.5÷5
x-7.4=8.5
x=8.5+7.4
x=15.5
5x+2.5×5=30
5x+12.5=30
5x=30-12.5
5x=17.5
x=17.5÷5
x=3.5