(x+y)的绝对值除以(x-y)等于2,求x/y
问题描述:
(x+y)的绝对值除以(x-y)等于2,求x/y
答
这是几年级的题目/
答
丨x+y丨/(x-y)=2
丨x+y丨=2(x-y)
(x+y)^2=4(x-y)^2
3x^2-10xy+3y^2=0
(x-3y)(3x-y)=0
x-3y=0,3x-y=0
x/y=3,x/y=1/3