题目内容
用简便方法计算. (1)(
| (2)
| ||||||||||||
(3)
| (4)85×
|
(1)(
3 |
4 |
5 |
6 |
=
3 |
4 |
5 |
6 |
=18+20,
=38;
(2)
13 |
15 |
8 |
9 |
8 |
9 |
2 |
15 |
=(
13 |
15 |
2 |
15 |
8 |
9 |
=
8 |
9 |
(3)
11 |
12 |
11 |
12 |
=
11 |
12 |
=
11 |
12 |
=22;
(4)85×
5 |
84 |
=(84+1)×
5 |
84 |
=84×
5 |
84 |
5 |
84 |
=5+
5 |
84 |
=5
5 |
84 |
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题目内容
用简便方法计算. (1)(
| (2)
| ||||||||||||
(3)
| (4)85×
|
3 |
4 |
5 |
6 |
3 |
4 |
5 |
6 |
13 |
15 |
8 |
9 |
8 |
9 |
2 |
15 |
13 |
15 |
2 |
15 |
8 |
9 |
8 |
9 |
11 |
12 |
11 |
12 |
11 |
12 |
11 |
12 |
5 |
84 |
5 |
84 |
5 |
84 |
5 |
84 |
5 |
84 |
5 |
84 |