7 |
9 |
11 |
5 |
2 |
9 |
5 |
11 |
=(
7 |
9 |
2 |
9 |
5 |
11 |
=1×
5 |
11 |
=
5 |
11 |
(2)4×1.28×25,
=1.28×(4×2.5),
=1.28×10,
=12.8;
(3)(
5 |
8 |
1 |
27 |
19 |
27 |
=
5 |
8 |
1 |
27 |
19 |
27 |
=5+(
8 |
27 |
19 |
27 |
=5+1,
=6.
7 |
9 |
11 |
5 |
2 |
9 |
5 |
11 |
5 |
8 |
1 |
27 |
19 |
27 |
7 |
9 |
11 |
5 |
2 |
9 |
5 |
11 |
7 |
9 |
2 |
9 |
5 |
11 |
5 |
11 |
5 |
11 |
5 |
8 |
1 |
27 |
19 |
27 |
5 |
8 |
1 |
27 |
19 |
27 |
8 |
27 |
19 |
27 |