问题
选择题
已知
|
答案
∵
+1 x
=3，1 y
∴通分得x+y=3xy，
∴
=3x+xy+3y x-xy+y
=3(x+y)+xy (x+y)-xy
=9xy+xy 3xy-xy
=5．10xy 2xy
故选A．
搜题请搜索小程序“爱下问搜题”
已知
|
∵
+1 x
=3，1 y
∴通分得x+y=3xy，
∴
=3x+xy+3y x-xy+y
=3(x+y)+xy (x+y)-xy
=9xy+xy 3xy-xy
=5．10xy 2xy
故选A．