题目内容
怎样简便就怎样算:
4.5+5.5×3.6×0.1;
5-
+
-
;
×0.16×
×0.124×
÷4×
;
10.8×(
+
+
);
(3.25-0.8×
)÷0.1.
4.5+5.5×3.6×0.1;
5-
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 2 |
| 1 |
| 2 |
10.8×(
| 2 |
| 3 |
| 5 |
| 6 |
| 4 |
| 9 |
(3.25-0.8×
| 5 |
| 8 |
分析:根据四则运算顺序进行计算,能用简便方法计算的用简便方法计算,10.8×(
+
+
)可用乘法分配律计算.
| 2 |
| 3 |
| 5 |
| 6 |
| 4 |
| 9 |
解答:解:(1)4.5+5.5×3.6×0.1,
=4.5+19.8×0.1,
=4.5+1.98,
=6.48;
(2)5-
+
-
,
=4
+
-
,
=5
-
,
=5;
(3)
×0.16×
×0.124×
÷4×
,
=0.04×
×0.124×
÷4×
,
=0.015×0.124×
÷4×
,
=0.00186×
÷4×
,
=0.00093÷4×
,
=0.0002325×
,
=0.00011625;
(4)10.8×(
+
+
),
=10.8×
+10.8×
+10.8×
,
=7.2+9+4.8,
=21;
(5)(3.25-0.8×
)÷0.1,
=(3.25-0.5)÷0.1,
=2.75÷0.1,
=27.5.
=4.5+19.8×0.1,
=4.5+1.98,
=6.48;
(2)5-
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
=4
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
=5
| 1 |
| 6 |
| 1 |
| 6 |
=5;
(3)
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 2 |
| 1 |
| 2 |
=0.04×
| 3 |
| 8 |
| 1 |
| 2 |
| 1 |
| 2 |
=0.015×0.124×
| 1 |
| 2 |
| 1 |
| 2 |
=0.00186×
| 1 |
| 2 |
| 1 |
| 2 |
=0.00093÷4×
| 1 |
| 2 |
=0.0002325×
| 1 |
| 2 |
=0.00011625;
(4)10.8×(
| 2 |
| 3 |
| 5 |
| 6 |
| 4 |
| 9 |
=10.8×
| 2 |
| 3 |
| 5 |
| 6 |
| 4 |
| 9 |
=7.2+9+4.8,
=21;
(5)(3.25-0.8×
| 5 |
| 8 |
=(3.25-0.5)÷0.1,
=2.75÷0.1,
=27.5.
点评:主要考查学生对于四则运算顺序及乘法分配律的理解.
练习册系列答案
相关题目