问题
解答题
计算: (1)(
(2)(
(3)
|
答案
(1)(
)-2+33+201101 2
=4+27+1
=32;
(2)(
-1 x3
+1 x2
)•x31 x
=1-x+x2;
(3)
-(x+y)2 xy (x-y)2 xy
=(x+y)2-(x-y)2 xy
=4xy xy
=4.
计算: (1)(
(2)(
(3)
|
(1)(
)-2+33+201101 2
=4+27+1
=32;
(2)(
-1 x3
+1 x2
)•x31 x
=1-x+x2;
(3)
-(x+y)2 xy (x-y)2 xy
=(x+y)2-(x-y)2 xy
=4xy xy
=4.