题目内容
简便计算.
| (3×
|
| ||||||||||||||||||||||||
14×
| (
|
(1)
×
+
×
=
×(
+
)
=
×
=
;
(2)(3×
)×4
×
×
=3×
×
×
×
=
;
(3)
×
+
×
=(
+
)×
=1×
=
;
(4)14×
-
=(14-1)×
=13×
=7;
(5)(
+
)×12
=
×12+
×12
=4+3
=7.
4 |
5 |
3 |
8 |
4 |
5 |
1 |
2 |
=
4 |
5 |
3 |
8 |
1 |
2 |
=
4 |
5 |
7 |
8 |
=
7 |
10 |
(2)(3×
5 |
12 |
3 |
7 |
2 |
9 |
7 |
8 |
=3×
5 |
12 |
31 |
7 |
2 |
9 |
7 |
8 |
=
155 |
144 |
(3)
4 |
9 |
2 |
3 |
2 |
3 |
5 |
9 |
=(
4 |
9 |
5 |
9 |
2 |
3 |
=1×
2 |
3 |
=
2 |
3 |
(4)14×
7 |
13 |
7 |
13 |
=(14-1)×
7 |
13 |
=13×
7 |
13 |
=7;
(5)(
1 |
3 |
1 |
4 |
=
1 |
3 |
1 |
4 |
=4+3
=7.
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