题目内容
下列各题怎样算简便就怎样算.
| (
|
| ||||||||||||||||
| 7×
|
(1)
×
÷
,
=
×
×
,
=
;
(2)(
-
)×60,
=
×60-
×60,
=15-3,
=12;
(3)
÷(
+
),
=
÷
,
=
;
(4)
÷[
÷(
-
)],
=
÷[
÷
],
=
÷
,
=1;
(5)7×
+7.3×25%,
=7×0.25+7.3×0.25,
=0.25×(7+7.3),
=0.25×14.3,
=3.575.
| 2 |
| 3 |
| 5 |
| 4 |
| 10 |
| 9 |
=
| 2 |
| 3 |
| 5 |
| 4 |
| 9 |
| 10 |
=
| 3 |
| 4 |
(2)(
| 1 |
| 4 |
| 1 |
| 20 |
=
| 1 |
| 4 |
| 1 |
| 20 |
=15-3,
=12;
(3)
| 2 |
| 3 |
| 1 |
| 6 |
| 1 |
| 9 |
=
| 2 |
| 3 |
| 5 |
| 18 |
=
| 12 |
| 5 |
(4)
| 3 |
| 4 |
| 5 |
| 16 |
| 2 |
| 3 |
| 1 |
| 4 |
=
| 3 |
| 4 |
| 5 |
| 16 |
| 5 |
| 12 |
=
| 3 |
| 4 |
| 3 |
| 4 |
=1;
(5)7×
| 1 |
| 4 |
=7×0.25+7.3×0.25,
=0.25×(7+7.3),
=0.25×14.3,
=3.575.
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