脱式计算(能简便的要用简便方法计算)(1)16+15+13(2)712+16-14(3)811+715-815(4)7-(34-15)(5)45-(415+13)(6)47+521-47+221.-数学
1 |
3 |
=
7 |
10 |
(2)
7 |
12 |
1 |
6 |
1 |
4 |
=
3 |
4 |
1 |
4 |
=1;
(3)
8 |
11 |
7 |
15 |
8 |
15 |
=
8 |
11 |
1 |
15 |
=
109 |
165 |
(4)7-(
3 |
4 |
1 |
5 |
=7-
11 |
20 |
=6
9 |
20 |
(5)
4 |
5 |
4 |
15 |
1 |
3 |
=
4 |
5 |
9 |
15 |
=
1 |
5 |
(6)
4 |
7 |