(X-5)(X-2)=2解方程!
人气：316 ℃ 时间：2020-01-31 01:40:22
解答
(X-5)(X-2)=2
X²-7X+10=2
X²-7X=-8
X²-7X+49/4=-8+49/4=17/4
(X-7/2)²=(±√17/2)²
X-7/2=±√17/2
X=(7-√17)/2,X=(7+√17)/2
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