已知X,Y满足X^2+X^2+5/4=2X+Y,求代数式XY/X+Y的值?门票赠完了.回答者只能说声“谢谢”.
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![已知X,Y满足X^2+X^2+5/4=2X+Y,求代数式XY/X+Y的值?门票赠完了.回答者只能说声“谢谢”.](/uploads/image/z/3581920-64-0.jpg?t=%E5%B7%B2%E7%9F%A5X%2CY%E6%BB%A1%E8%B6%B3X%5E2%2BX%5E2%2B5%2F4%3D2X%2BY%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8FXY%2FX%2BY%E7%9A%84%E5%80%BC%3F%E9%97%A8%E7%A5%A8%E8%B5%A0%E5%AE%8C%E4%BA%86.%E5%9B%9E%E7%AD%94%E8%80%85%E5%8F%AA%E8%83%BD%E8%AF%B4%E5%A3%B0%E2%80%9C%E8%B0%A2%E8%B0%A2%E2%80%9D.)
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已知X,Y满足X^2+X^2+5/4=2X+Y,求代数式XY/X+Y的值?门票赠完了.回答者只能说声“谢谢”.
已知X,Y满足X^2+X^2+5/4=2X+Y,求代数式XY/X+Y的值?
门票赠完了.
回答者只能说声“谢谢”.
已知X,Y满足X^2+X^2+5/4=2X+Y,求代数式XY/X+Y的值?门票赠完了.回答者只能说声“谢谢”.
x²-2x+1+y²-y+1/4=0
(x-1)²+(y-1/2)²=0
∴x-1=0
y-1/2=0
∴x=1
y=1/2
∴xy/(x+y)
=1/2/(1+1/2)
=1/3