题目内容

计算下面各题,能简算的要简算.
5
12
+
3
8
)×
8
15
36×(
1
3
-
1
8
 
7
12
×11+
7
12
7
8
×
3
49
×
8
9
 
8
35
×
1
4
+
1
3
(3-
1
51
)×17.
分析:(1)(2)(3)(6)运用乘法分配律简算;
(4)约分计算;
(5)先算括号内的,再算括号外的.
解答:解:(1)(
5
12
+
3
8
)×
8
15

=
5
12
×
8
15
+
3
8
×
8
15

=
2
9
+
1
5

=
19
45


(2)36×(
1
3
-
1
8
),
=36×
1
3
-36×
1
8

=12-4.5,
=7.5;

(3)
7
12
×11+
7
12

=
7
12
×(11+1),
=
7
12
×12,
=7;

(4)
7
8
×
3
49
×
8
9

=
3
56
×
8
9

=
1
21


(5)
8
35
×
1
4
+
1
3
),
=
8
35
×
7
12

=
2
15


(6)(3-
1
51
)×17,
=3×17-
1
51
×17,
=51-
1
3

=50
2
3
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定律进行简便计算.
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