2x+5x=2.8的解方程 还有10(x-15)=1.8(X+2.4)÷4=1.6

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2x+5x=2.8的解方程还有10(x-15)=1.8(X+2.4)÷4=1.62x+5x=2.8的解方程还有10(x-15)=1.8(X+2.4)÷4=1.62x+5x=2.8的解方程还有10(x-

2x+5x=2.8的解方程 还有10(x-15)=1.8(X+2.4)÷4=1.6
2x+5x=2.8的解方程
还有10(x-15)=1.8
(X+2.4)÷4=1.6

2x+5x=2.8的解方程 还有10(x-15)=1.8(X+2.4)÷4=1.6
2x+5x=2.8
7x=2.8
x=2.8/7
x=0.4
10(x-15)=1.8
10x-150=1.8
10x=1.8+150
x=151.8/10
x=15.18
(X+2.4)÷4=1.6
x+2.4=1.6*4
x+2.4=6.4
x=6.4-2.4
x=4

  1.     7x=2.8

         x=0.4

  2. 10x-150=1.8

    10x=151.8

    x=15.18

  3. x+2.4=1.6*4=6.4

    x=4

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2x+5x=2.8
7x=2.8
x=2.8/7
x=0.4
10(x-15)=1.8
10x-150=1.8
10x=1.8+150
x=151.8/10
x=15.18
(X+2.4)÷4=1.6
x+2.4=1.6*4
x+2.4=6.4
x=6.4-2.4
x=4