(x+2((3-x)≤0 -6x^+7x>2
1个回答
(x+2)(3-x)≤0等价于(x+2)(x-3)≥0 解得x≥3或x≤-2
-6x^+7x>2 即 6x^2-7x+2
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x^3+6x^2-7x-2=0高考
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