计算下列各题,能简算的要简算.(1)25+13+35(2)34-15-38(3)79+15-(15+59)(4)23+(12-14)(5)1-817-917(6)311+718+811-118.-数学
3 |
8 |
=
30 |
40 |
8 |
40 |
15 |
40 |
=
22 |
40 |
15 |
40 |
=
7 |
40 |
(3)
7 |
9 |
1 |
5 |
1 |
5 |
5 |
9 |
=
7 |
9 |
1 |
5 |
1 |
5 |
5 |
9 |
=(
7 |
9 |
5 |
9 |
1 |
5 |
1 |
5 |
=
2 |
9 |
=
2 |
9 |
(4)
2 |
3 |
1 |
2 |
1 |
4 |
=
2 |
3 |
2 |
4 |
1 |
4 |
=
2 |
3 |
1 |
4 |
=
8 |
12 |