题目内容
用简便方法计算下面各题.
(1)8-
| (2)
|
(1)8-
×5-
,
=8-
-
,
=8-(
+
),
=8-1,
=7;
(2)
×(
+
),
=
×
+
×
,
=
+
,
=
.
| 3 |
| 19 |
| 4 |
| 19 |
=8-
| 15 |
| 19 |
| 4 |
| 19 |
=8-(
| 15 |
| 19 |
| 4 |
| 19 |
=8-1,
=7;
(2)
| 5 |
| 9 |
| 3 |
| 5 |
| 9 |
| 10 |
=
| 5 |
| 9 |
| 3 |
| 5 |
| 5 |
| 9 |
| 9 |
| 10 |
=
| 1 |
| 3 |
| 1 |
| 2 |
=
| 5 |
| 6 |
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