作业帮 > 数学 > 作业

x^2-7xy+12y^2=0,求x^2-2xy+y^2/2xy的值

来源：学生作业帮 编辑：大师作文网作业帮 分类：数学作业 时间：2024/11/19 15:58:54
x^2-7xy+12y^2=0,求x^2-2xy+y^2/2xy的值
x^2-7xy+12y^2=0,求x^2-2xy+y^2/2xy的值
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
已知x²-7xy+12y²=0求x²-xy+y²/2xy的值 已知x-xy=8,xy-y=-9,求x+y-2xy的值 若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 已知y-x-2xy=0,求3x+xy-3y/y-xy-x的值 已知y-x-2xy=0,求(3x+xy-3y)\(y-xy-x)的值 已知xy^2=-2,求-xy（x^2y^5-xy^3-y)的值. 已知x^2-7xy+12y=0,且x.y不等于0,求x^2-2xy+y^2/2xy的值 如果x^2+xy+y-14,y^@+xy+x=28,求x+y的值. 已知X+Y=3XY,求2X+2Y-XY除以X+Y+2XY的值,要算理. 已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值! 已知x+y=3xy,求2x+2y-xy/x+y+2xy的值、 若(y-x)/xy=3,求分式(2x+3xy-2y)/(x-2xy-y)的值