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180/(x-15)-180/x=2
人气:359 ℃ 时间:2020-03-30 12:02:36
解答
180/(x-15)-180/x=2
90/(x-15)-90/x=1
90x-90(x-15)=x(x-15)
x^2-15x-1350=0
(x-45)(x+30)=0
x1=45,x2=-30
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