作业帮没有写的填空..那道题怎么算?
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没有写的填空..那道题怎么算?
没有写的填空..那道题怎么算?
没有写的填空..那道题怎么算?
分解公因式会吗?
(x+1)/(x²-1)-(x²-2x)/(x²-1)÷(x²-x-2)/(x²+2x+1)
=(x+1)/(x+1)(x-1)-x(x-2)/(x+1)(x-1)÷(x-2)(x+1)/(x+1)²
=1/(x-1)-x(x-2)/(x+1)(x-1)×(x+1)/(x-2)
=1/(x-1)-x/(x-1)
=(1-x)/(x-1)
=-(x-1)/(x-1)
=-1