先化简，再求值。x+2分之x-x+2分之x平方+2x+1除以x-1分之x平方-1
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解
x/(x+2)-(x²+2x+1)/(x+2)÷(x²-1)/(x-1)
=x/(x+2)-(x+1)²/(x+2)÷(x-1)(x+1)/(x-1)
=x/(x+2)-(x+1)²/(x+2)÷(x+1)
=x/(x+2)-(x+1)/(x+2)
=(x-x-1)/(x+2)
=-1/(x+2)
x/(x+2)-(x²+2x+1)/(x+2)÷(x²-1)/(x-1)
=x/(x+2)-(x+1)²/(x+2)÷(x-1)(x+1)/(x-1)
=x/(x+2)-(x+1)²/(x+2)÷(x+1)
=x/(x+2)-(x+1)/(x+2)
=(x-x-1)/(x+2)
=-1/(x+2)
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