问题 解答题
计算
(1)
27
-
12
+
45
;                  
(2)
5
3
÷
10
9
+
1
7
×
63

(3)
2
3
-1
+(
3
-1)2

(4)
8
2
+(
10
-
5
)0-
2
2
答案

(1)

27
-
12
+
45

=3

3
-2
3
+3
5

=

3
+3
5
;                  

(2)

5
3
÷
10
9
+
1
7
×
63

=

3
2
+3

=3+

1
2
6

(3)

2
3
-1
+(
3
-1)2

=

3
+1+3-2
3
+1

=5-

3

(4)

8
2
+(
10
-
5
)0-
2
2

=

2
+1-
2

=1.

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