x^2-7xy+12y^2=0
(x-3y)(x-4y)=0
x=3y或x=4y
当x=3y时
(x^2-2xy+y^2)/2xy
=(x-y)^2/2xy
=(3y-y)^2/2*3y*y
=4y^2/6y^2
=4/6
=2/3
当x=4y时
(x^2-2xy+y^2)/2xy
=(x-y)^2/2xy
=(4y-y)^2/2*4y*y
=9y^2/8y^2
=9/8
x^2-7xy+12y^2=0,求x^2-2xy+y^2/2xy的值
2个回答
相关问题
-
已知|x+2|+(y−12)2＝0，求4xy-[（x2+5xy-y2）-（x2+3xy-y2）]的值．
-
x-y+3xy=0 求2x+3xy-2y/x-2xy-y的值
-
已知(x+2)²+|y+1|=0,求(2x²-xy)-2(x²-y²+xy)+(2xy-2y²) 的值
-
x^2+y^2=7,xy=-2,求5x^2-3xy-4y^2-11xy-7x^2+2y^2的值
-
已知|x+2|+(y−12)2＝0，求代数式4xy-（x2+5xy-y2）+（x2+3xy）的值．
-
求4xy-[x^y-(2xy-2x^y)+xy]-2x^2的值
-
x^2+y^2=7,xy=-2,求多项式5x^2-3xy-4y^2-11xy-7x^2+2y^2的值
-
已知：x2+y2＝2，xy＝−12，求代数式：（2x2-y2-3xy）-（x2-2y2+xy）的值．
-
已知x/2=y/3（xy≠0）,求x²-2xy-3y²/x²-6xy-7y²的值
-
已知x2+xy=7 y2+xy=2 求x-y的值