(1)
原式
=(x-1)/(x-1)平方+1/(x-1)(x+1)
=1/(x-1)+1/(x-1)(x+1)
=(x+1+1)/(x-1)(x+1)
=(x+2)/(x平方-1)
(3)
原式
=(x-y)/(x-2y)乘[(x-2y)平方/(x+y)(x-y)]
=(x-2y)/(x+y)
手机提问的朋友在客户端右上角评价点【满意】即可
(1)
原式
=(x-1)/(x-1)平方+1/(x-1)(x+1)
=1/(x-1)+1/(x-1)(x+1)
=(x+1+1)/(x-1)(x+1)
=(x+2)/(x平方-1)
(3)
原式
=(x-y)/(x-2y)乘[(x-2y)平方/(x+y)(x-y)]
=(x-2y)/(x+y)
手机提问的朋友在客户端右上角评价点【满意】即可