咋做（要详细步骤）

更新时间2021-01-25 10:58:29

要详细步骤

❶x(x-2)-(2-x)²=x(x-2)-(x-2)²=2(x-2)

❷1/(1-x)÷(x²+2x)/(x²-2x+1)+1/(x+2)

=[1/(1-x)]*{(1-x)²/[x(x+2)]}+1/(x+2)

=(1-x)/[x(x+2)]+x/[x(x+2)]

=1/[x(x+2)]