问题
解答题
化简: (1)计算:(-1)3+(2010-
(2)(x2-xy)÷
|
答案
(1)(-1)3+(2010-
)0-|-2
|1 2
=-1+1-1 2
=-1 2
(2)(x2-xy)÷
•x2-2xy+y2 y x2-y2 x2y
=x(x-y)•
•y (x-y)2 (x+y)(x-y) x2y
=
.x+y x
化简: (1)计算:(-1)3+(2010-
(2)(x2-xy)÷
|
(1)(-1)3+(2010-
)0-|-2
|1 2
=-1+1-1 2
=-1 2
(2)(x2-xy)÷
•x2-2xy+y2 y x2-y2 x2y
=x(x-y)•
•y (x-y)2 (x+y)(x-y) x2y
=
.x+y x