脱式计算.712×821×32÷425÷51289×97÷47(34+23)÷712(45-23)×250%78-(12-14)÷716.-数学
=2÷(
4 |
25 |
5 |
12 |
=2÷
1 |
15 |
=30;
(3)
8 |
9 |
9 |
7 |
4 |
7 |
=
8 |
7 |
4 |
7 |
=2;
(4)(
3 |
4 |
2 |
3 |
7 |
12 |
=(
3 |
4 |
2 |
3 |
12 |
7 |
=
3 |
4 |
12 |
7 |
2 |
3 |
12 |
7 |
=
9 |
7 |
8 |
7 |
=2
3 |
7 |
(5)(
4 |
5 |
2 |
3 |
=
2 |
15 |
=
4 |
25 |
5 |
12 |
1 |
15 |
8 |
9 |
9 |
7 |
4 |
7 |
8 |
7 |
4 |
7 |
3 |
4 |
2 |
3 |
7 |
12 |
3 |
4 |
2 |
3 |
12 |
7 |
3 |
4 |
12 |
7 |
2 |
3 |
12 |
7 |
9 |
7 |
8 |
7 |
3 |
7 |
4 |
5 |
2 |
3 |
2 |
15 |