1/(x²+x)×1/(x²-1)
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1/(x²+x)×1/(x²-1)
1/(x²+x)×1/(x²-1)
1/(x²+x)×1/(x²-1)
1/(x²+x)×1/(x²-1)= 1/x(1+x)×1/(x-1)(x+1)
=1/[x(x-1)(x+1)²]
中间是乘法??
1/﹙x²+x﹚×1/﹙x²-1﹚
=1/x﹙x+1﹚×1/﹙x-1﹚﹙x+1﹚
=1/x﹙x-1﹚x+1﹚².