问题 解答题
计算:
(1)
27
-
12
+
45
;                    
(2)
8
+3
1
3
-
1
2
+
3
2

(3)
2
2
(2
12
+4
1
8
-3
48
)

(4)
3a
2b
•(
b
a
÷2
1
b
)
答案

(1)原式=3

3
-2
3
+3
5

=

3
+3
5

(2)原式=2

2
+3×
3
3
-
2
2
×
2
+
3
2

=2

2
+
3
-
1
2
2
+
1
2
3

=

3
2
2
+
3
2
3

(3)原式=

2
2
×2
12
+
2
2
×4
1
8
-
2
2
×3
48

=2

6
+1-6
6

=1-4

6

(4)原式=(

1
2b
•1•
1
2
3a•
b
a
b
1

=

1
4b
3b2

=

3
4

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