函数y=(x-1)/(x+1) 如何去分母?得到变量X?1:x=-(Y+1)/(y-1) =》2.(1+y)/(1-y)

问题描述:

函数y=(x-1)/(x+1) 如何去分母?得到变量X?1:x=-(Y+1)/(y-1) =》2.(1+y)/(1-y)

1:x=-(Y+1)/(y-1) =》2.(1+y)/(1-y)
把负号乘到分母就得到了