数学问题 解方程
(1)12(x^2+1/x^2)-56(x+1/x)+89=0(2)(1/(x+5))+(1/(x+8))=(1/(x+6))+(1/(x+7))...
(1) 12(x^2+1/x^2) - 56(x+1/x)+89=0
(2) (1/(x+5) ) + (1/(x+8)) =(1/(x+6)) +(1/(x+7)) 展开
(2) (1/(x+5) ) + (1/(x+8)) =(1/(x+6)) +(1/(x+7)) 展开
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