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主要内容

多项式的正, 负区间

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问题

f, left parenthesis, x, right parenthesis, equals, x, left parenthesis, 4, x, plus, 9, right parenthesis, left parenthesis, x, minus, 2, right parenthesis, left parenthesis, 2, x, minus, 9, right parenthesis, left parenthesis, x, plus, 5, right parenthesis这个方程的零出现在x, equals, minus, 5x, equals, minus, start fraction, 9, divided by, 4, end fractionx, equals, 0x, equals, 2,以及x, equals, start fraction, 9, divided by, 2, end fraction
f0, is less than, x, is less than, 2, space这段间隔中的输出是正或负?
选出正确答案:
不会做了?
不会做了?