Question

已知

x+y

x

=4，则

x+2y

2x-y

=______．

Answer 1

x+y

x

=1+

y

x

=4，

y

x

=3，则

x+2y

2x-y

=

1+ 2y x

2- y x

=

1+2×3

2-3

=-7．