4个回答
展开全部
x²-4xy+4y²=0
(x-2y)^2=0
x=2y
x-y/x+y
=(2y-y)/(2y+y)
=y/3y
=1/3
(x-2y)^2=0
x=2y
x-y/x+y
=(2y-y)/(2y+y)
=y/3y
=1/3
追问
如果x/2=y/3,那么(7x²-y²)/(x²-2xy+3y²)=__________
谢谢奥,不要过程
追答
x/2=y/3,
那么(7x²-y²)/(x²-2xy+3y²)
=[7x^2-(3/2x)^2]/[x^2-2x*3x/2+3(3x/2)^2]
=(7x^2-9x^2/4)/(x^2-3x^2+27x^2/4)
=(19x^2/4)/(19x^2/4)
=1
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展开全部
x²-4xy+4y²=0
(x-2y)²=0
x=2y
(x-y)/(x+y)
=(2y-y)/(2y+y)
=y/3y
=1/3
如果x/2=y/3,那么(7x²-y²)/(x²-2xy+3y²)=____1______
(x-2y)²=0
x=2y
(x-y)/(x+y)
=(2y-y)/(2y+y)
=y/3y
=1/3
如果x/2=y/3,那么(7x²-y²)/(x²-2xy+3y²)=____1______
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展开全部
x²-4xy+4y²=0
(x-2y)^2=0
x=2y
x-y/x+y
=(2y-y)/(2y+y)
=y/3y
=1/3
(x-2y)^2=0
x=2y
x-y/x+y
=(2y-y)/(2y+y)
=y/3y
=1/3
追问
如果x/2=y/3,那么(7x²-y²)/(x²-2xy+3y²)=__________
不要过程谢谢
追答
1
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