题目内容
| 计算下面各题,能简便计算的用简便方法计算. 4.82-5.2÷0.8×0.6 | [
| ||||||||
| 12.3×99 | ||||||||
57.5-14.25-15
| 3.2×12.5×0.25. |
(1)4.82-5.2÷0.8×0.6,
=4.82-6.5×0.6,
=4.82-3.9,
=0.92;
(2)[
-(
-
)]÷
,
=[
-
]÷
,
=
÷
,
=
;
(3)
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)12.3×99,
=12.3×(100-1),
=12.3×100-12.3×1,
=1230-12.3,
=1217.7;
(5)57.5-14.25-15
,
=57.5-(14.25+15
),
=57.5-30,
=27.5;
(6)3.2×12.5×0.25,
=8×0.4×12.5×0.25,
=(8×12.5)×(0.4×0.25),
=100×0.1,
=10.
=4.82-6.5×0.6,
=4.82-3.9,
=0.92;
(2)[
| 1 |
| 2 |
| 3 |
| 4 |
| 3 |
| 5 |
| 7 |
| 10 |
=[
| 1 |
| 2 |
| 3 |
| 20 |
| 7 |
| 10 |
=
| 7 |
| 20 |
| 7 |
| 10 |
=
| 1 |
| 2 |
(3)
| 7 |
| 9 |
| 5 |
| 11 |
| 2 |
| 9 |
| 5 |
| 11 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 5 |
| 11 |
=1×
| 5 |
| 11 |
=
| 5 |
| 11 |
(4)12.3×99,
=12.3×(100-1),
=12.3×100-12.3×1,
=1230-12.3,
=1217.7;
(5)57.5-14.25-15
| 3 |
| 4 |
=57.5-(14.25+15
| 3 |
| 4 |
=57.5-30,
=27.5;
(6)3.2×12.5×0.25,
=8×0.4×12.5×0.25,
=(8×12.5)×(0.4×0.25),
=100×0.1,
=10.
练习册系列答案
相关题目