[x/(x-1)-1/(x²-1)]÷(x+1)
=[X(X+1)-1]/[(X+1)(X-1)]×1/(X+1) ——通分,化除为乘,
=(X²+X-1)/[(x+1)²(x-1)] ——不能约分,题目有点奇怪,
当X=√2时,
原式=(1+√2)/[(√2+1)²(√2-1)[
=1/[(√2+1)(√2-1)]
=1.
[x/(x-1)-1/(x²-1)]÷(x+1)
=[X(X+1)-1]/[(X+1)(X-1)]×1/(X+1) ——通分,化除为乘,
=(X²+X-1)/[(x+1)²(x-1)] ——不能约分,题目有点奇怪,
当X=√2时,
原式=(1+√2)/[(√2+1)²(√2-1)[
=1/[(√2+1)(√2-1)]
=1.