问题 解答题
计算:
(1)(
1
2
)-2+33+20110

(2)(
1
x3
-
1
x2
+
1
x
)•x3

(3)
(x+y)2
xy
-
(x-y)2
xy
答案

(1)(

1
2
)-2+33+20110

=4+27+1

=32;

(2)(

1
x3
-
1
x2
+
1
x
)•x3

=1-x+x2

(3)

(x+y)2
xy
-
(x-y)2
xy

=

(x+y)2-(x-y)2
xy

=

4xy
xy

=4.

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