题目内容
2.4×[3
÷(3-2.4×
)]-[1-(
-
÷
)]÷
= ．
| 4 |
| 5 |
| 14 |
| 15 |
| 5 |
| 7 |
| 1 |
| 2 |
| 3 |
| 4 |
| 2 |
| 7 |
分析：两个中括号同时计算，两部分都先算小括号内的，再算中括号内的，然后算括号外的，最后算减法计算．
解答：解：2.4×[3
÷（3-2.4×
）]-[1-（
-
÷
）]÷
=2.4×[3
÷（3-
×
）]-[1-（
-
×
）]÷
=2.4×[3
÷（3-
）]-[1-（
-
）]÷
=2.4×[3
÷
]-[1-
]÷
=2.4×[
×
]-[1-
]÷
=2.4×5-
×
=12-3
=7
故答案为：7
．
| 4 |
| 5 |
| 14 |
| 15 |
| 5 |
| 7 |
| 1 |
| 2 |
| 3 |
| 4 |
| 2 |
| 7 |
=2.4×[3
| 4 |
| 5 |
| 12 |
| 5 |
| 14 |
| 15 |
| 5 |
| 7 |
| 1 |
| 2 |
| 4 |
| 3 |
| 2 |
| 7 |
=2.4×[3
| 4 |
| 5 |
| 56 |
| 25 |
| 5 |
| 7 |
| 2 |
| 3 |
| 2 |
| 7 |
=2.4×[3
| 4 |
| 5 |
| 19 |
| 25 |
| 1 |
| 21 |
| 2 |
| 7 |
=2.4×[
| 19 |
| 5 |
| 25 |
| 19 |
| 1 |
| 21 |
| 2 |
| 7 |
=2.4×5-
| 20 |
| 21 |
| 7 |
| 2 |
=12-3
| 1 |
| 3 |
=7
| 2 |
| 3 |
故答案为：7
| 2 |
| 3 |
点评：此题解答的关键在于掌握四则混合运算的顺序，以及数字的相互转化．
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