题目内容

用你喜欢的方法计算.
15÷
5
9
×
1
6
×8                                      
5
6
÷3+
1
6
×
1
3
1
9
×101-
1
9
÷
1
2
                            
1
7
+
1
5
+
1
14
)×70
1
56
÷
1
7
+
55
56
×7                                   
5
7
×
1
6
÷
5
7
×
1
6
分析:(1)按照从左到右的顺序计算;
(2)(3)(5)先把除法变成乘法,再运用乘法分配律简算;
(4)运用乘法分配律简算;
(6)先把除法变成乘法再运用乘法交换律和结合律简算.
解答:解:(1)15÷
5
9
×
1
6
×8
=15×
9
5
×
1
6
×8
=27×
1
6
×8
=
9
2
×8
=36;

(2)
5
6
÷3+
1
6
×
1
3

=
5
6
×
1
3
+
1
6
×
1
3

=(
5
6
+
1
6
)×
1
3

=1×
1
3

=
1
3


(3)
1
9
×101-
1
9
÷
1
2

=
1
9
×101-
1
9
×2
=
1
9
×(101-2)
=
1
9
×99
=11;

(4)(
1
7
+
1
5
+
1
14
)×70
=
1
7
×70+
1
5
×70+
1
14
×70
=10+14+5
=29;

(5)
1
56
÷
1
7
+
55
56
×7  
=
1
56
×7+
55
56
×7  
=(
1
56
+
55
56
)×7
=1×7
=7;

(6)
5
7
×
1
6
÷
5
7
×
1
6

=
5
7
×
1
6
×
7
5
×
1
6

=(
5
7
×
7
5
)×(
1
6
×
1
6

=1×
1
36

=
1
36
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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