题目内容
能简便的用简便方法计算．
|
999
|
69.87-6.25-（29.87+3.75） | ||||||||||||||||
| 0.05×[ | (24+
|
|
（1）
| 5 |
| 6 |
| 9 |
| 20 |
=
| 5 |
| 6 |
=
| 5 |
| 6 |
| 1 |
| 3 |
=
| 1 |
| 2 |
（2）999
| 8 |
| 9 |
| 8 |
| 9 |
| 8 |
| 9 |
| 1 |
| 3 |
=999
| 8 |
| 9 |
| 8 |
| 9 |
| 8 |
| 9 |
| 1 |
| 9 |
| 1 |
| 9 |
| 1 |
| 9 |
=（999
| 8 |
| 9 |
| 1 |
| 9 |
| 8 |
| 9 |
| 1 |
| 9 |
| 8 |
| 9 |
| 1 |
| 9 |
=1000+100+10，
=1110；
（3）69.87-6.25-（29.87+3.75），
=69.87-6.25-29.87-3.75，
=（69.87-29.87）-（6.25+3.75），
=40-10，
=30；
（4）0.05×[ 10.6÷(4.5+
| 4 |
| 5 |
=0.05×[10.6÷5.3]，
=0.05×2，
=0.1；
（5）(24+
| 4 |
| 9 |
| 3 |
| 8 |
| 4 |
| 9 |
| 5 |
| 8 |
=24×
| 3 |
| 8 |
| 4 |
| 9 |
| 3 |
| 8 |
| 4 |
| 9 |
| 5 |
| 8 |
=9+
| 4 |
| 9 |
| 3 |
| 8 |
| 5 |
| 8 |
=9+
| 4 |
| 9 |
=9
| 4 |
| 9 |
（6）
| 2 |
| 3 |
| 2 |
| 15 |
| 2 |
| 35 |
| 2 |
| 63 |
=
| 2 |
| 1×3 |
| 2 |
| 3×5 |
| 2 |
| 5×7 |
| 2 |
| 7×9 |
=（1-
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 9 |
=1-
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 9 |
=1-
| 1 |
| 9 |
=
| 8 |
| 9 |
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