x/y=2
x=2y
x²-3xy+y²/2x²-3xy+5y²
=(4y²-6y²+y²)/(8y²-6y²+5y²)
=-y²/7y²
=-1/7
x/y=2,求x²-3xy+y²/2x²-3xy+5y²
4个回答
相关问题
-
x y=5,xy=3求代数式x^3y-2x^2y^2=xy^3
-
5x²y-[2²y-(3xy-xy²)-3x²]-2xy²-y
-
xy+ 2=0,x+y-3=0求(3xy+10y))+[5x-(2xy+2y-3x)]
-
已知y-x=3xy 求2x+5xy-2y/x-2xy-y
-
已知Y-x=3xy,求(5x+3xy-5y)÷(x-2xy-y)
-
xy^2=-3,求-xy(x^2y^5-xy^3-y)
-
已知:x+y=3,xy=-2,求:1.(3x-4y+2xy）-（2x-5y+5xy）的值；2.（3x-5y+4xy）-（
-
已知xy/(x+y)=2求(3x-5y+3y)/(-x+3xy-y)
-
(5x²y-2xy²-3xy)-(2xy+5x²y-2xy²),x=-1/5,y
-
已知x²+y²=5,xy=2,求（2x²+xy+3y²)-(x²-xy