问题 解答题
脱式计算(能简算的要简算).
4
5
+
11
15
+
3
10
14.2×24-28.4×2
5
6
+
2
7
+
1
6
+
5
7
1
2
-
1
3
-
1
6
4-
7
11
-
4
11
9
10
-(
1
2
+
1
3
9
8
-
5
12
-
7
12
17
24
-(
5
6
-
2
3
17
18
+
5
8
-
3
8
答案

(1)

4
5
+
11
15
+
3
10

=

23
15
+
3
10

=1

5
6

(2)14.2×24-28.4×2

=14.2×24-14.2×2×2,

=14.2×(24-4),

=14.2×20,

=284;

(3)

5
6
+
2
7
+
1
6
+
5
7

=(

5
6
+
1
6
)+(
2
7
+
5
7
),

=1+1,

=2;

(4)

1
2
-
1
3
-
1
6

=

1
6
-
1
6

=0;

(5)4-

7
11
-
4
11

=4-(

7
11
+
4
11
),

=4-1,

=3;

(6)

9
10
-(
1
2
+
1
3

=

9
10
-
5
6

=

1
15

(7)

9
8
-
5
12
-
7
12

=

9
8
-(
5
12
+
7
12
),

=

9
8
-1,

=

1
8

(8)

17
24
-(
5
6
-
2
3

=

17
24
-
1
6

=

13
24

(9)

17
18
+
5
8
-
3
8

=

17
18
+(
5
8
-
3
8
),

=

17
18
+
1
4

=1

7
36

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