题目内容
计算下面各题.(能简便的用简便方法计算)
|
|
|
(1)
×
+
÷
,
=
×
+
×
,
=
×(
+
),
=
×
,
=
;
(2)
×(
-
×
),
=
×(
-
),
=
×
,
=
;
(3)
×11-
,
=
×(11-1),
=
×10,
=9.
| 6 |
| 5 |
| 2 |
| 15 |
| 2 |
| 15 |
| 4 |
| 5 |
=
| 6 |
| 5 |
| 2 |
| 15 |
| 2 |
| 15 |
| 5 |
| 4 |
=
| 2 |
| 15 |
| 6 |
| 5 |
| 5 |
| 4 |
=
| 2 |
| 15 |
| 49 |
| 20 |
=
| 49 |
| 150 |
(2)
| 8 |
| 3 |
| 1 |
| 3 |
| 8 |
| 21 |
| 8 |
| 16 |
=
| 8 |
| 3 |
| 1 |
| 3 |
| 4 |
| 21 |
=
| 8 |
| 3 |
| 1 |
| 7 |
=
| 8 |
| 21 |
(3)
| 9 |
| 10 |
| 9 |
| 10 |
=
| 9 |
| 10 |
=
| 9 |
| 10 |
=9.
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