(x+5)(x+2)(x-1)(x-4)=[(x+5)(x-4)][(x+2)(x-1)]
=(x^2+x-20)(x^2+x-2)
解不等式(x+5)(x+2)(x-1)(x-4)≤-80.
解不等式(x+5)(x+2)(x-1)(x-4)≤-80.
数学人气:226 ℃时间:2020-02-04 07:14:22
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