计算x/(x-1)÷(x-1/x)A.1/(x-1)B.1C.1/(x+1)D.-1

Question

计算x/(x-1)÷(x-1/x) A.1/(x-1) B.1 C.1/(x+1) D.-1

Answer 1

这个题不对
假设第一个是(x-1)/x
则原式=(x-1)/x÷(x²-1)/x
=(x-1)/x*x/(x+1)(x-1)
约分
=1/(x+1)
选C