问题 解答题
脱式计算(能简算的要简算).
15
1
2
-4
5
12
-3
3
8
4.63+5
8
11
+5.64+1
3
11
9
5
7
-(2
1
13
+4
5
7
+
11
13
)
18
11
-(
7
11
+
3
8
)
7
9
+
3
10
-
2
9
+
17
10
15
11
-
3
8
-
5
8
答案

(1)15

1
2
-4
5
12
-3
3
8

=11

1
12
-3
3
8

=7

17
24

(2)4.63+5

8
11
+5.64+1
3
11

=(4.63+5.64)+(5

8
11
+1
3
11
),

=10.27+7,

=17.27;

(3)9

5
7
-(2
1
13
+4
5
7
+
11
13
),

=(9

5
7
-4
5
7
)-(2
1
13
+
11
13
)
),

=5-2

12
13

=2

1
13

(4)

18
11
-(
7
11
+
3
8
),

=

18
11
-
7
11
-
3
8

=1-

3
8

=

5
8

(5)

7
9
+
3
10
-
2
9
+
17
10

=(

7
9
-
2
9
)+(
3
10
+
17
10
),

=

5
9
+2,

=2

5
9

(6)

15
11
-
3
8
-
5
8

=

15
11
-(
3
8
+
5
8
),

=

15
11
-1,

=

4
11

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