=(2.87-0.87)+(5.6+4.4),
=2+10,
=12;
(2)
11 |
18 |
11 |
18 |
=(9-6)×
11 |
18 |
=3×
11 |
18 |
=
11 |
6 |
(3)420÷7÷6,
=420÷(6×7),
=420÷42,
=10;
(4)
9 |
10 |
1 |
4 |
7 |
20 |
3 |
4 |
=
9 |
10 |
3 |
5 |
4 |
3 |
=
9 |
10 |
4 |
5 |
=
1 |
10 |
(5)
1 |
2 |
3 |
5 |
(
1 |
2 |
3 |
5 |
11 |
10 |
11 |
10 |
11 |
10 |
11 |
10 |
x=4.4×
10 |
11 |
x=4.
2.87+5.6-0.87+4.4 |
| 420÷7÷6 | |||||||||||
|
|
11 |
18 |
11 |
18 |
11 |
18 |
11 |
18 |
11 |
6 |
9 |
10 |
1 |
4 |
7 |
20 |
3 |
4 |
9 |
10 |
3 |
5 |
4 |
3 |
9 |
10 |
4 |
5 |
1 |
10 |
1 |
2 |
3 |
5 |
1 |
2 |
3 |
5 |
11 |
10 |
11 |
10 |
11 |
10 |
11 |
10 |
10 |
11 |