题目内容
简便方法计算. (
|
| 5.2×
|
(1)(
+
)×7
=
×7+
×7
=3+
=3
;
(2)
×63%+
×63%
=(
+
)×63%
=2×0.63
=1.26;
(3)5.2×
+1.8×0.25
=(5.2+1.8)×0.25
=7×0.25
=1.75.
3 |
7 |
3 |
28 |
=
3 |
7 |
3 |
28 |
=3+
3 |
4 |
=3
3 |
4 |
(2)
3 |
5 |
7 |
5 |
=(
3 |
5 |
7 |
5 |
=2×0.63
=1.26;
(3)5.2×
1 |
4 |
=(5.2+1.8)×0.25
=7×0.25
=1.75.
练习册系列答案
相关题目