问题 解答题
0.125+4
7
11
-1
7
11
+
7
8

5.98+
10
29
+
1
50

1
5
12
+4
3
7
+2
7
12

9
7
10
-1
3
40
-4.925.
答案

(1)0.125+4

7
11
-1
7
11
+
7
8

=

1
8
+4
7
11
-1
7
11
+
7
8

=(

1
8
+
7
8
)+(4
7
11
-1
7
11
),

=1+3,

=4;

(2)5.98+

10
29
+
1
50

=5

49
50
+
10
29
+
1
50

=5

49
50
+
1
50
+
10
29

=6+

10
29

=6

10
29

(3)1

5
12
+4
3
7
+2
7
12

=1

5
12
+2
7
12
+4
3
7

=4+4

3
7

=8

3
7

(4)9

7
10
-1
3
40
-4.925,

=9

7
10
-1
3
40
-4
37
40

=9

7
10
-(1
3
40
+4
37
40
),

=9

7
10
-6,

=3

7
10

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