用你喜欢的方法计算.79-23+561920+15-9201-114-3715.8-(14.8+23)78-34+18378-149-159.-数学
(2)
19 |
20 |
1 |
5 |
9 |
20 |
=
19 |
20 |
4 |
20 |
9 |
20 |
=
7 |
10 |
(3)1-
1 |
14 |
3 |
7 |
=1-(
1 |
14 |
6 |
14 |
=1-
1 |
2 |
=
1 |
2 |
(4)15.8-(14.8+
2 |
3 |
=15.8-14.8-
2 |
3 |
=1-
2 |
3 |
=
1 |
3 |
(5)
7 |
8 |
3 |
4 |
1 |
8 |
=
7 |
8 |
1 |
8 |
3 |
4 |
=1-
3 |
4 |
=