6X方-X=2 谁知道?
人气:431 ℃ 时间:2020-07-08 09:41:58
解答
x²-x/6=1/3
x²-x/6+1/144=1/3+1/144
(x-1/12)²=49/144
x-1/12=±7/12
x=-1/2,x=2/3
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