58+79+382518-25-3523+710+13+31059-512+4989-(15-19)512+1115-615+712.-数学
2 |
5 |
3 |
5 |
=
25 |
18 |
2 |
5 |
3 |
5 |
=
25 |
18 |
=
7 |
18 |
(3)
2 |
3 |
7 |
10 |
1 |
3 |
3 |
10 |
=(
2 |
3 |
1 |
3 |
7 |
10 |
3 |
10 |
=1+1,
=2;
(4)
5 |
9 |
5 |
12 |
4 |
9 |
=(
5 |
9 |
4 |
9 |
5 |
12 |
=1-
5 |
12 |
=
7 |
12 |
(5)
8 |
9 |
1 |
5 |
1 |
9 |
=
8 |
9 |
1 |
5 |
1 |
9 |
=(
8 |
9 |
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