已知x平方+5x-990=0,求x立方-6x平方-985x-1010的值
已知x平方+5x-990=0,求x立方-6x平方-985x-1010的值
数学人气:672 ℃时间:2019-08-21 01:49:51
优质解答
错了,是x³+6x²-985x-1010即x²+5x=990所以原式=x³+5x²+x²-985x-1010=x(x²+5x)+x²-985x-1010=990x+x²-985x-1010=x²+5x-1010=990-1010=-20
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