题目内容
怎样简便就怎样算.
6÷
|
| 2-
| (
|
(1)6÷
-
÷6,
=20-
,
=19
;
(2)
×
-
×
,
=(
-
)×
,
=
×
,
=
;
(3)2-
-
,
=2-(
+
),
=2-1,
=1;
(4)(
+
+
)×60,
=
×60+
×60+
×60,
=20+15+12,
=47.
| 3 |
| 10 |
| 3 |
| 10 |
=20-
| 1 |
| 20 |
=19
| 19 |
| 20 |
(2)
| 3 |
| 4 |
| 5 |
| 7 |
| 3 |
| 4 |
| 1 |
| 7 |
=(
| 5 |
| 7 |
| 1 |
| 7 |
| 3 |
| 4 |
=
| 4 |
| 7 |
| 3 |
| 4 |
=
| 3 |
| 7 |
(3)2-
| 5 |
| 11 |
| 6 |
| 11 |
=2-(
| 5 |
| 11 |
| 6 |
| 11 |
=2-1,
=1;
(4)(
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
=
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
=20+15+12,
=47.
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