数学分式化简求值
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数学分式化简求值数学分式化简求值数学分式化简求值原式=(xy-y²-x²-xy)/(x²-y²)×(x+y)/(x²+y²)=-(x
数学分式化简求值
数学分式化简求值
数学分式化简求值
原式=(xy-y²-x²-xy)/(x²-y²)×(x+y)/(x²+y²)
=-(x²+y²)/(x+y)(x-y) ×(x+y)/(x²+y²)
=-1/(x-y)
当x=2,y=-1时
原式=-1/(2+1)=-1/3