作业帮化简：[(x+1)/(x²-1)]×（x-3）已知ab=﹣1，a+b=2，则式子b/a+a/b=?(上面两个都要答案)
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化简：[(x+1)/(x²-1)]×（x-3）已知ab=﹣1，a+b=2，则式子b/a+a/b=?(上面两个都要答案)
化简：[(x+1)/(x²-1)]×（x-3）
已知ab=﹣1，a+b=2，则式子b/a+a/b=?(上面两个都要答案)
化简：[(x+1)/(x²-1)]×（x-3）已知ab=﹣1，a+b=2，则式子b/a+a/b=?(上面两个都要答案)
：[(x+1)/(x²-1)]×（x-3）
=(x+1)/(x+1)(x-1)×(x-3)
=1/(x-1)×(x-3)
=(x-3)/(x-1)
b/a+a/b=(a²+b²)/ab=[(a²+2ab+b²)-2ab]/ab=[(a+b)²-2ab]/ab=(4+2)/(-1)=-6
(X-3)/(X-1)
化简结果为X-3/x-1
b/a+a/b=-6