问题 解答题
怎样简单怎样算.
5
9
+(
3
4
-
1
2

9
7
+
1
8
+
3
8
+
5
7

10
3
-
3
10
-
7
10

5.56-
3
7
+4.44-
4
7
答案

(1)

5
9
+(
3
4
-
1
2

=

5
9
+
1
4

=

29
36

(2)

9
7
+
1
8
+
3
8
+
5
7

=(

9
7
+
5
7
)+(
1
8
+
3
8

=2+

1
2

=2

1
2

(3)

10
3
-
3
10
-
7
10

=

10
3
-(
3
10
+
7
10

=

10
3
-1

=2

1
3

(4)5.56-

3
7
+4.44-
4
7

=(5.56+4.44)-(

3
7
+
4
7

=10-1

=9.

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