脱式计算,能简算的要简算25+415+3579-518+1612+58-3445-(215+13)12-(34-38)47-78+37.-数学
=
14 |
18 |
5 |
18 |
3 |
18 |
=
14-5+3 |
18 |
=
2 |
3 |
(3)
1 |
2 |
5 |
8 |
3 |
4 |
=
4 |
8 |
5 |
8 |
6 |
8 |
=
4+5-6 |
8 |
=
3 |
8 |
(4)
4 |
5 |
2 |
15 |
1 |
3 |
=
12 |
15 |
2 |
15 |
5 |
15 |
=
12 |
15 |
7 |
15 |
=
1 |
3 |
(5)
1 |
2 |
3 |
4 |
3 |
8 |
=
4 |
8 |
6 |
8 |
3 |
8 |
=
4 |
8 |
3 |
8 |
=