若3x-2y=0,则(x+y):(x-y)=_.
问题描述:
若3x-2y=0,则(x+y):(x-y)=______.
答
若3x-2y=0,
则3x=2y,x=
y,2 3
把x的值代入(x+y):(x-y),
得
=
y+y2 3
y−y2 3
=−5.
y5 3 −
y1 3
故(x+y):(x-y)=-5.
故答案为-5.