问题
解答题
用递等式计算(能简算的要用简便方法计算). ①13×8×125 ②8.9×99+1.1×99 ③12.12÷(4.3×2-7.4) ④
⑤
|
答案
①13×8×125,
=13×(8×125),
=13×1000,
=13000,
②8.9×99+1.1×99,
(8.9+1.1)×99,
=10×99,
=990,
③12.12÷(4.3×2-7.4),
=12.12÷1.2,
=10.1,
④
4 |
7 |
7 |
24 |
1 |
5 |
6 |
5 |
=
1 |
6 |
1 |
6 |
=
1 |
3 |
⑤
1 |
4 |
1 |
2 |
1 |
4 |
=
1 |
4 |
1 |
4 |
=1.