问题 填空题
若5x-7y=0,则
x
y
=______;若
x+y
y
=
7
3
,那么
x
y
=______.
答案

由5x-7y=0,即5x=7y,

x
y
=
7
5

x+y
y
=
7
3

x
y
=
x+y-y
y
=
7-3
3
=
4
3

单项选择题
单项选择题