精英家教网 > 小学数学 > 题目详情
2
3
÷1
1
2
×
7
18
14
1
7
×2
1
2
×4
1÷
9
11
-
9
11
÷1
1÷0.45×
13
20
1
2
-
1
6
+
5
12
)×36
2
1
2
×0.45×3.5
分析:(1)(4)(6)按照从左到右的顺序计算;
(2)运用乘法结合律简算;
(3)同时运算除法,再算减法;
(5)运用乘法分配律简算.
解答:解:(1)
2
3
÷1
1
2
×
7
18

=
4
9
×
7
18

=
14
81


(2)14
1
7
×2
1
2
×4

=
99
7
×(
5
2
×4),
=
99
7
×10,
=
990
7


(3)1÷
9
11
-
9
11
÷1

=
11
9
-
9
11

=
40
99


(4)1÷0.45×
13
20

=
20
9
×
13
20

=
13
9


(5)(
1
2
-
1
6
+
5
12
)×36,
=
1
2
×36-
1
6
×36+
5
12
×36,
=18-6+15,
=12+15
=27;

(6)2
1
2
×0.45×3.5

=1.125×3.5,
=3.9375.
点评:此题主要考查分数、整数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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