(1)23 •6

(1)2
3
6

(2)
−4
2
3
7

(3)
12
×
4
−5
(4)
6
×
3
12

(5)(
5
+1)2
(6)(
2
+1)(
2
-1)
(7)(2
6
+3
3
)•
1
2
2

(8)
3
11
÷
3
2
3

(9)(4-3
5
)(4+3
5

(10)
1
2
(
2
+
3
)−
3
4
2
27

(11)(
a
b
+
b
a
2
(12)
(a−3)2
(a<3)
(13)已知x=
3
2
3
+
2
,y=
3
+
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