已知x的平方+3x+1=0,求x+x的-1次方的值
人气:433 ℃ 时间:2019-10-19 08:24:48
解答
x²+3x+1=0 两边同时除以x得
x+3+x的-1次方=0
x+x的-1次方=-3
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