题目内容

计算,能简算的要简算.
6.12+
3
7
+2.88+
4
7
29
24
-(
5
24
-
4
9
)
7
15
+
7
12
+
8
15
-
7
12
15
11
-
3
8
-
5
8
5
6
+
7
9
+
3
8
5
8
-
2
5
+
1
4
14
15
-(
2
3
-
1
5
)
19
20
+(
4
5
-
7
40
)
分析:(1)(3)根据加法交换律和加法结合律进行计算;
(2)(4)(7)根据减法的性质进行计算;
(5)(6)先通分,再计算;
(8)先算括号里面的,再算加法.
解答:解:(1)6.12+
3
7
+2.88+
4
7

=(6.12+2.88)+(
3
7
+
4
7
),
=9+1,
=10;

(2)
29
24
-(
5
24
-
4
9
),
=
29
24
-
5
24
+
4
9

=1+
4
9

=1
4
9


(3)
7
15
+
7
12
+
8
15
-
7
12

=(
7
15
+
8
15
)+(
7
12
-
7
12
),
=1+0,
=1;

(4)
15
11
-
3
8
-
5
8

=
15
11
-(
3
8
+
5
8
),
=
15
11
-1,
=
4
11


(5)
5
6
+
7
9
+
3
8

=
60
72
+
56
72
+
27
72

=
143
72


(6)
5
8
-
2
5
+
1
4

=
25
40
-
16
40
+
10
40

=
19
40


(7)
14
15
-(
2
3
-
1
5
)

=
14
15
-
7
15

=
7
15


(8)
19
20
+(
4
5
-
7
40
)

=
19
20
-
25
40

=
13
40
点评:本题主要考查了学生四则运算的计算能力,以及有计算中灵活运用简便算法的计算能力.
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