题目内容
(2012?呼和浩特)
| 能简算的要简算 (1)10.64+4.5×3.6+11.36 |
(2)7×(
|
(3)
| ||||||||||||||||||||||
(4)2+
|
(5)
|
(6)
|
分析:按照小数、分数四则混合运算的运算顺序和它们的计算法则进行计算,其中算式(2)和算式(3)可以运用乘法分配律进行简算.
解答:解:(1)10.64+4.5×3.6+11.36,
=10.64+16.2+11.36,
=38.2;
(2)7×(
+
+
),
=7×
+7×
+7×
,
=
+
+
,
=
+
+
,
=
,
=1
;
(3)
×
+
÷
,
=
×(
+
),
=
×1,
=
;
(4)2+
÷
×
,
=2+
×
×
,
=2+
,
=2
;
(5)
×(
+
÷
),
=
×(
+
×
),
=
×
,
=
;
(6)
÷[(
+
)×
],
=
÷[
×
],
=
÷
,
=
×
,
=
.
=10.64+16.2+11.36,
=38.2;
(2)7×(
| 1 |
| 14 |
| 1 |
| 35 |
| 1 |
| 21 |
=7×
| 1 |
| 14 |
| 1 |
| 35 |
| 1 |
| 21 |
=
| 1 |
| 2 |
| 1 |
| 5 |
| 1 |
| 3 |
=
| 15 |
| 30 |
| 6 |
| 30 |
| 10 |
| 30 |
=
| 31 |
| 30 |
=1
| 1 |
| 30 |
(3)
| 13 |
| 21 |
| 5 |
| 9 |
| 13 |
| 21 |
| 9 |
| 4 |
=
| 13 |
| 21 |
| 5 |
| 9 |
| 4 |
| 9 |
=
| 13 |
| 21 |
=
| 13 |
| 21 |
(4)2+
| 1 |
| 7 |
| 3 |
| 7 |
| 1 |
| 2 |
=2+
| 1 |
| 7 |
| 7 |
| 3 |
| 1 |
| 2 |
=2+
| 1 |
| 6 |
=2
| 1 |
| 6 |
(5)
| 2 |
| 3 |
| 1 |
| 8 |
| 1 |
| 2 |
| 4 |
| 5 |
=
| 2 |
| 3 |
| 1 |
| 8 |
| 1 |
| 2 |
| 5 |
| 4 |
=
| 2 |
| 3 |
| 3 |
| 4 |
=
| 1 |
| 2 |
(6)
| 2 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
| 8 |
| 13 |
=
| 2 |
| 5 |
| 13 |
| 15 |
| 8 |
| 13 |
=
| 2 |
| 5 |
| 8 |
| 15 |
=
| 2 |
| 5 |
| 15 |
| 8 |
=
| 3 |
| 4 |
点评:此题主要考查小数、分数四则混合运算的计算,完成本题要注意分析式中数据,运用合适的简便方法计算.
练习册系列答案
相关题目