题目内容
计算下列各题,能简算的要简算.
| (1)12.5×3.2×25 | (2)3
| (3)(
| ||||||||||||||||
(4)
| (5)19-19×
| (6)(8-10×
|
(1)12.5×3.2×25,
=12.5×0.8×4×25,
=(12.5×0.8)×(4×25),
=10×100,
=1000;
(2)3
-1.16-1.84+1
,
=(3
+1
)-(1.16+1.84),
=5-3,
=2;
(3)(
+
-
)÷24,
=(
-
)÷24,
=
÷24,
=
;
(4)
×[
-(
-
)],
=
×[
+
-
],
=
×(1-
),
=
×
,
=
;
(5)19-19×
,
=19×1-19×
,
=19×(1-
),
=19×
,
=
;
(6)(8-10×
)÷
,
=(8-8)÷
,
=0÷
,
=0.
=12.5×0.8×4×25,
=(12.5×0.8)×(4×25),
=10×100,
=1000;
(2)3
| 7 |
| 9 |
| 2 |
| 9 |
=(3
| 7 |
| 9 |
| 2 |
| 9 |
=5-3,
=2;
(3)(
| 3 |
| 8 |
| 3 |
| 4 |
| 1 |
| 2 |
=(
| 9 |
| 8 |
| 1 |
| 2 |
=
| 5 |
| 8 |
=
| 5 |
| 192 |
(4)
| 4 |
| 9 |
| 3 |
| 4 |
| 7 |
| 10 |
| 1 |
| 4 |
=
| 4 |
| 9 |
| 3 |
| 4 |
| 1 |
| 4 |
| 7 |
| 10 |
=
| 4 |
| 9 |
| 7 |
| 10 |
=
| 4 |
| 9 |
| 3 |
| 10 |
=
| 2 |
| 15 |
(5)19-19×
| 19 |
| 20 |
=19×1-19×
| 19 |
| 20 |
=19×(1-
| 19 |
| 20 |
=19×
| 1 |
| 20 |
=
| 19 |
| 20 |
(6)(8-10×
| 4 |
| 5 |
| 1 |
| 3 |
=(8-8)÷
| 1 |
| 3 |
=0÷
| 1 |
| 3 |
=0.
练习册系列答案
相关题目