2(x-3)平方=3(x-1)(x+1)-(x+1)平方

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2(x-3)平方=3(x-1)(x+1)-(x+1)平方

2(x-3)平方=3(x-1)(x+1)-(x+1)平方
2(x-3)平方=3(x-1)(x+1)-(x+1)平方

2(x-3)平方=3(x-1)(x+1)-(x+1)平方
2(x-3)平方=3(x-1)(x+1)-(x+1)平方
2(x^2-6x+9)=3(x^2-1)-(x^2+2x+1)
2x^2-12x+18=3x^2-3-x^2-2x-1
-12x+2x=-18-4
-10x=-22
x=2.2

x平方+5x-7=0 下边的就你自己解吧

2(x²-2.x.3+3²)=3(x²-1²)-(x+1)²
2x²-12x+18=3(x²-1²)-(x²+2.x.1+1²)
2x²-12x+18=3x²-3-x²-2x-1
...

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2(x²-2.x.3+3²)=3(x²-1²)-(x+1)²
2x²-12x+18=3(x²-1²)-(x²+2.x.1+1²)
2x²-12x+18=3x²-3-x²-2x-1
2x²-12x+18=2x²-4-2x
2x²- 2x²-12x+2x=-4-18
-10x=-22
x=11/5

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