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+5

chjmfbdisk2022-10-04 11:39:541条回答

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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bugun 共回答了18个问题 | 采纳率88.9%: 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; 1年前