Question

舅舅啊啊啊啊啊啊啊x平方+2x/1+x÷(x- 2/x+1),其中x=-2分之1

Answer 1

原式=x(x+2)/(x+1)÷(x²+x+1-2)/(x+1)

=x(x+2)/(x+1)*(x+1)/(x+2)(x-1)

=x/(x-1)

=(-1/2)/(-3/2)

=1/3