分式乘除运算
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分式乘除运算
分式乘除运算
分式乘除运算
x²+4y²+4y-4x+5=x²-4x+4+4y²+4y+1=(x-2)²+(2y+1)²=0
所以,x=2, y=-1/2
原式= (x²+y²)(x²-y²)/[(x+2y)(x-y)] * (x+2y)/[y(x-y)] * (-y)/(x²+y²)
= -(x²-y²)/(x-y)² = -(x+y)/(x-y)= -3/2﹢5/2 = -3/5