题目内容
计算,能简算的要简算.
3
|
| ||||||||||||
| [
|
(1)3
×15
-1.25×15
,
=(3
-1.25)×15
,
=2×15
,
=31
;
(2)
×40%+
×40%,
=(
+
)×40%,
=1×0.4,
=0.4;
(3)
+(1-
)÷
,
=
+
÷
,
=
+4,
=4
;
(4)[
-(
-0.25)]×
,
=[
-
]×
,
=
×
,
=
.
| 1 |
| 4 |
| 2 |
| 3 |
| 2 |
| 3 |
=(3
| 1 |
| 4 |
| 2 |
| 3 |
=2×15
| 2 |
| 3 |
=31
| 1 |
| 3 |
(2)
| 2 |
| 7 |
| 5 |
| 7 |
=(
| 2 |
| 7 |
| 5 |
| 7 |
=1×0.4,
=0.4;
(3)
| 1 |
| 50 |
| 2 |
| 5 |
| 3 |
| 20 |
=
| 1 |
| 50 |
| 3 |
| 5 |
| 3 |
| 20 |
=
| 1 |
| 50 |
=4
| 1 |
| 50 |
(4)[
| 3 |
| 4 |
| 7 |
| 16 |
| 17 |
| 9 |
=[
| 3 |
| 4 |
| 3 |
| 16 |
| 17 |
| 9 |
=
| 9 |
| 16 |
| 17 |
| 9 |
=
| 17 |
| 16 |
练习册系列答案
相关题目