题目内容

计算(能简算的要简算)
5
8
+
1
4
)×24  
18+
3
11
×
3
12
19×(
7
38
+
6
19
3
8
×
4
5
+
2
5
4
7
×(
3
8
+
5
12
)  
55×(
7
33
+
7
55
76×
8
75
+74×
8
75
分析:(1)(3)(5)(6)(7)运用乘法分配律简算;
(2)(4)先算乘法,再算加法.
解答:解:(1)(
5
8
+
1
4
)×24,
=
5
8
×24+
1
4
×24,
=15+6,
=21;

(2)18+
3
11
×
3
12

=18+
3
44

=18
3
44


(3)19×(
7
38
+
6
19
),
=19×
7
38
+19×
6
19

=3
1
2
+6,
=9
1
2


(4)
3
8
×
4
5
+
2
5

=
3
10
+
2
5

=
7
10


(5)
4
7
×(
3
8
+
5
12
),
=
4
7
×
19
24

=
19
42


(6)55×(
7
33
+
7
55
),
=55×
7
33
+
7
55
×55,
=11
2
3
+7,
=18
2
3


(7)76×
8
75
+74×
8
75

=(76+74)×
8
75

=150×
8
75

=16.
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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