递等式计算(能简算的要简算):112+38+(58+512)89-(118+79)79+112-111823+67-23+673-1726+152612-1115+12-415.-数学
=1
1 |
2 |
(2)
8 |
9 |
1 |
18 |
7 |
9 |
=
8 |
9 |
7 |
9 |
1 |
18 |
=
1 |
9 |
1 |
18 |
=
1 |
18 |
(3)
7 |
9 |
1 |
12 |
11 |
18 |
=
31 |
36 |
11 |
18 |
=
1 |
4 |
(4)
2 |
3 |
6 |
7 |
2 |
3 |
6 |
7 |
=(
2 |
3 |
2 |
3 |
6 |
7 |
6 |
7 |
=0+
12 |
7 |
=
12 |
7 |
(5)3-
17 |
26 |
15 |
26 |
=3-(
17 |
26 |
15 |
26 |
=3-
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