简算
| 4-
| 10.1×9.9 | ||||||||||||
30×(
| 76÷3+13×
|
| 3 |
| 4 |
| 1 |
| 8 |
| 7 |
| 8 |
| 3 |
| 4 |
=
| 3 |
| 4 |
| 1 |
| 8 |
| 7 |
| 8 |
=
| 3 |
| 4 |
=
| 3 |
| 4 |
(2)4-
| 4 |
| 9 |
| 5 |
| 9 |
=4-(
| 4 |
| 9 |
| 5 |
| 9 |
=4-1
=3;
(3)10.1×9.9,
=10×9.9+0.1×9.9,
=99+0.99,
=99.99;
(4)30×(
| 2 |
| 5 |
| 1 |
| 6 |
| 4 |
| 15 |
=30×
| 2 |
| 5 |
| 1 |
| 6 |
| 4 |
| 15 |
=12+5-8,
=9;
(5)76÷3+13×
| 1 |
| 3 |
| 1 |
| 3 |
=76×
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
=(76+13+1)×
| 1 |
| 3 |
=90×
| 1 |
| 3 |
=30.