题目内容
怎样简便就怎样算.
20×
| (
|
|
(1)20×
×
=8×
,
=6;
(2)(
+
+
)÷
=(
+
+
)×12,
=
×12+
×12+
×12,
=9+8+
,
=17
;
(3)
×
+
×
=(
+
)×
,
=1×
,
=
.
| 2 |
| 5 |
| 3 |
| 4 |
=8×
| 3 |
| 4 |
=6;
(2)(
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 24 |
| 1 |
| 12 |
=(
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 24 |
=
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 24 |
=9+8+
| 1 |
| 2 |
=17
| 1 |
| 2 |
(3)
| 7 |
| 11 |
| 2 |
| 7 |
| 7 |
| 11 |
| 5 |
| 7 |
=(
| 2 |
| 7 |
| 5 |
| 7 |
| 7 |
| 11 |
=1×
| 7 |
| 11 |
=
| 7 |
| 11 |
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