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解下列方程:(x+2)²=3(x+2) (3x-1)²-(2x...

∵(x+2)²=0 ∴x=-2 ∵(3x-1)²-(2x...

9x²=16 x²=16/9 x=4/3 2x²...

25(1+x)²=36 (1+x)²=36/25 1+x=±...

解 原式 =(5x²-x²)+(-x-5x)+(2-3) ...

(x²+3x-4)²=(3x²-4x+2)&a...

①(2x-1)²-x²-4x-4=0 (2x-1)&#...

(x-2)²-1²=0 (x-3)(x-1)=0 x=3或x...

(2x-1)(x+1)=(x+1)² (2x-1)(x+1)-(x+1)&...

2(1-x)²=x-3 2(1-2x+x²)=x-3 2x&...

解: y=x+1代入y=x²-2x+3 x+1=x²-2x+...

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