问题
填空题
计算 (x-1+y-1)÷(x-1-y-1)=______.
答案
原式=(
+1 x
)÷(1 y
-1 x
)=1 y
÷x+y xy
=y-x xy
.y+x y-x
故答案为:
.y+x y-x
计算 (x-1+y-1)÷(x-1-y-1)=______.
原式=(
+1 x
)÷(1 y
-1 x
)=1 y
÷x+y xy
=y-x xy
.y+x y-x
故答案为:
.y+x y-x