试题:
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:

我来补答
(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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