Question

化简,第1、3小题

Answer 1

(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)

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