递等式计算.(能用简便方法的要用简便方法计算)38×1114+314×3849+311+59+11157×1415×1021101×38-38551×5229×51×9×1217.-数学
3 |
8 |
=1×
3 |
8 |
=
3 |
8 |
(2)
4 |
9 |
3 |
11 |
5 |
9 |
1 |
11 |
=(
4 |
9 |
5 |
9 |
3 |
11 |
1 |
11 |
=1+
4 |
11 |
=1
4 |
11 |
(3)
5 |
7 |
14 |
15 |
10 |
21 |
20 |
63 |
(4)101×
3 |
8 |
3 |
8 |
=(101-1)×
3 |
8 |
=100×
3 |
8 |
=
75 |
2 |
(5)
5 |
51 |
=
5 |
51 |
=