问题 填空题
1
x
+
1
y
=2,则
2x-xy+2y
3x+5xy+3y
=______
答案

1
x
+
1
y
=2,得x+y=2xy

2x-xy+2y
3x+5xy+3y
=
2(x+y)-xy
3(x+y)+5xy
=
2•2xy-xy
3•2xy+5xy
=
3xy
11xy
=
3
11

故答案为

3
11

判断题
填空题