题目内容
下面各题怎样算简便就怎样算.
×
+
×
×(
-
)
138×
.
| 3 |
| 14 |
| 1 |
| 3 |
| 2 |
| 3 |
| 3 |
| 14 |
| 5 |
| 6 |
| 3 |
| 8 |
138×
| 7 |
| 137 |
(1)
×
+
×
×(
-
),
=
×
+
×
×
,
=
×(
+
×
),
=
×(
+
),
=
×
,
=
;
(2)138×
,
=(137+1)×
,
=137×
+1×
,
=7+
,
=7
.
| 3 |
| 14 |
| 1 |
| 3 |
| 2 |
| 3 |
| 3 |
| 14 |
| 5 |
| 6 |
| 3 |
| 8 |
=
| 3 |
| 14 |
| 1 |
| 3 |
| 2 |
| 3 |
| 3 |
| 14 |
| 11 |
| 24 |
=
| 3 |
| 14 |
| 1 |
| 3 |
| 2 |
| 3 |
| 11 |
| 24 |
=
| 3 |
| 14 |
| 1 |
| 3 |
| 11 |
| 36 |
=
| 3 |
| 14 |
| 23 |
| 36 |
=
| 23 |
| 168 |
(2)138×
| 7 |
| 137 |
=(137+1)×
| 7 |
| 137 |
=137×
| 7 |
| 137 |
| 7 |
| 137 |
=7+
| 7 |
| 137 |
=7
| 7 |
| 137 |
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