问题
填空题
若
|
答案
∵
=x y
,3 4
∴x=
y,3 4
∴
=x+y y
=
y+y3 4 y
;7 4
=x+2y 2x-y
=
y+2y3 4 2×
y-y3 4
.11 2
故答案为:
;7 4
.11 2
若
|
∵
=x y
,3 4
∴x=
y,3 4
∴
=x+y y
=
y+y3 4 y
;7 4
=x+2y 2x-y
=
y+2y3 4 2×
y-y3 4
.11 2
故答案为:
;7 4
.11 2