1.(x^2-2x-3)(x+4)
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1.(x^2-2x-3)(x+4)
1.(x^2-2x-3)(x+4)
1.(x^2-2x-3)(x+4)
【1】
(x²-2x-3)(x+4)≤0
(x-3)(x+1)(x+4)≤0
则:
x≤-4或-1≤x≤3
解集是:{x|x≤-4或-1≤x≤3}
【2】
x²-4x+4≤0
(x-2)²≤0
x=2
解集是:{2}
【3】
(x+2)/(2x+1)
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