(7.5-x)*3 2x=19.
人气:498 ℃ 时间:2020-06-20 05:23:05
解答
-32x*7.5+32x^2+19.5=0
x^2-7.5x+39/64=0
(x-7.5/2)^2-7.5^2*16/64+39/64=0
(x-7.5)^2=261/64
x-7.5=±√261/8
x1=7.5+√261/8
x2=7.5-√261/8
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