题目内容
下面各题怎么简便就怎么算
42×(
-
+
)
48×75%+53×
-0.75
45÷7+19×
-
(
-
)×(
+
)
42×(
| 5 |
| 6 |
| 3 |
| 7 |
| 3 |
| 14 |
48×75%+53×
| 3 |
| 4 |
45÷7+19×
| 1 |
| 7 |
| 1 |
| 7 |
(
| 3 |
| 4 |
| 3 |
| 16 |
| 2 |
| 9 |
| 1 |
| 3 |
(1)42×(
-
+
),
=42×
-42×
+42×
,
=35-18+9,
=26;
(2)48×75%+53×
-0.75,
=48×0.75+53×0.75-0.75,
=0.75×(48+53-1),
=0.75×100,
=75;
(3)45÷7+19×
-
,
=45×
+19×
-
×1,
=(45+19-1)×
,
=63×
,
=9;
(4)(
-
)×(
+
)
=
×
=
.
| 5 |
| 6 |
| 3 |
| 7 |
| 3 |
| 14 |
=42×
| 5 |
| 6 |
| 3 |
| 7 |
| 3 |
| 14 |
=35-18+9,
=26;
(2)48×75%+53×
| 3 |
| 4 |
=48×0.75+53×0.75-0.75,
=0.75×(48+53-1),
=0.75×100,
=75;
(3)45÷7+19×
| 1 |
| 7 |
| 1 |
| 7 |
=45×
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 7 |
=(45+19-1)×
| 1 |
| 7 |
=63×
| 1 |
| 7 |
=9;
(4)(
| 3 |
| 4 |
| 3 |
| 16 |
| 2 |
| 9 |
| 1 |
| 3 |
=
| 9 |
| 16 |
| 5 |
| 9 |
=
| 5 |
| 16 |
练习册系列答案
相关题目