问题
选择题
化简(x-2-y-2)÷(x-1+y-1)的结果是( )
|
答案
原式=(
-1 x2
)÷(1 y2
+1 x
)1 y
=
÷y2-x2 x2y2 y+x xy
=
•(y+x)(y-x) (xy)2 xy y+x
=
,y-x xy
故选:B.
化简(x-2-y-2)÷(x-1+y-1)的结果是( )
|
原式=(
-1 x2
)÷(1 y2
+1 x
)1 y
=
÷y2-x2 x2y2 y+x xy
=
•(y+x)(y-x) (xy)2 xy y+x
=
,y-x xy
故选:B.