a的平方加上ab减去6b的平方等于零,求a+b/b-a
人气:379 ℃ 时间:2020-05-03 03:37:35
解答
a²+ab-6b²=0
(a+3b)(a-2b)=0
a=-3b或a=2b
当a=-3b时
(a+b)/(b-a)=-2b/4b=-1/2
当a=2b时
(a+b)/(b-a)=3b/(-b)=-3
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