2（x+5)^2-(x+6)^2-(x+2)(x-2)=42 (2x+1)(x-3)-(2x+3)(x-1)大于等于12

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2（x+5)^2-(x+6)^2-(x+2)(x-2)=42 (2x+1)(x-3)-(2x+3)(x-1)大于等于12
2（x+5)^2-(x+6)^2-(x+2)(x-2)=42 (2x+1)(x-3)-(2x+3)(x-1)大于等于12

2（x+5)^2-(x+6)^2-(x+2)(x-2)=42 (2x+1)(x-3)-(2x+3)(x-1)大于等于12
2（x+5)^2-(x+6)^2-(x+2)(x-2)=42
2x²+20x+50-x²-12x-36-x²+4=42
8x=-12
x=-3/2
(2x+1)(x-3)-(2x+3)(x-1)大于等于12
2x²-x-3-2x²-x+3>=12
-2x>=12
x

先分析第一个不等式组 x-3(x-2）≤4 x-3x+6≤4 -2x≤-2 x≥1 再分析第二个不等式组（a+2x）/3>x-1 a+2x>3x-3 -x>-3-a x<3+a

2（x+5)^2-(x+6)^2-(x+2)(x-2)=42
2x²+20x+50-x²-12x-36-x²+4=42
8x=24
x=3
(2x+1)(x-3)-(2x+3)(x-1)≥12
2x²-5x-3-2x²-x+3≥12
-6x≥12
x≤2

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