选择合理的方法进行计算(1)1315-16+56(2)25-512-718(3)23+16-512(4)23+45-(45-15)(5)3-(1921-914)(6)715+1115-(310+1115)-五年级数学
7 |
18 |
=25-(
5 |
12 |
7 |
18 |
=25-
29 |
36 |
=24
7 |
36 |
(3)
2 |
3 |
1 |
6 |
5 |
12 |
=
8 |
12 |
2 |
12 |
5 |
12 |
=
10 |
12 |
5 |
12 |
=
5 |
12 |
(4)
2 |
3 |
4 |
5 |
4 |
5 |
1 |
5 |
=
2 |
3 |
4 |
5 |
3 |
5 |
=
22 |
15 |
3 |
5 |
=
13 |
15 |
(5)3-(
19 |
21 |
9 |
14 |
=3-
11 |
42 |
=2
31 |
42 |
(6)
7 |
15 |
11 |
15 |