几道解不等式 1.X²-2X-3＞0 2.X²+3X-4≤0 3.3X²-7X+2＜0 4.-X²-X+20＞0
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几道解不等式1.X²-2X-3＞02.X²+3X-4≤03.3X²-7X+2＜04.-X²-X+20＞0几道解不等式1.X²-2X-3＞02.X
几道解不等式 1.X²-2X-3＞0 2.X²+3X-4≤0 3.3X²-7X+2＜0 4.-X²-X+20＞0
几道解不等式 1.X²-2X-3＞0 2.X²+3X-4≤0 3.3X²-7X+2＜0 4.-X²-X+20＞0
几道解不等式 1.X²-2X-3＞0 2.X²+3X-4≤0 3.3X²-7X+2＜0 4.-X²-X+20＞0
1.X²-2X-3＞0
(x-3)(x+1)>0
x>3 or x