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3(x–9)=18的解方程怎么解?

3x-27=18 x=(18+27)÷3 x=15

13乘(x–3)=5x+9 帮我解方程 解: 13x-39=5x+9 13x-5x=9+39 8x=48 x=6

3(x-2)=9.6, x-2=9.6÷3, x-2=3.2, x=3.2+2, x=5.2

-12-48-28x+8=0 28x=-12-48+8 28x=-52 x=-13/7

x-2.8=9*0.06x=0.54+2.8x=3.34

2(x-3)-(x+3)(x-3)=0 (x-3)(2x-6-x-3)=0 (x-3)(x-9)=0 解得x1=3,x2=9

x–38=18 x-38+38=18+38 x=56

(x-2)/(x+3) - 3/(x-3)=1 (x-2)(x-3)-3(x+3)=(x+3)(x-3) x²-5x+6-3x-9=x²-9 8x=6 x=3/4

x²–2x–3=0 (x-3)(x+1)=0 x1-3=0;x2+1=0 x1=3;x2=-1

0.9x=18 x=20

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