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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