题目内容
脱式计算
5400-2940÷28×27
（20.2×40%+7.88）÷4.2
（
+
）÷
+
10÷[2.6-（
÷
+
）]．
5400-2940÷28×27
（20.2×40%+7.88）÷4.2
（
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
10÷[2.6-（
| 5 |
| 13 |
| 5 |
| 26 |
| 2 |
| 5 |
（1）5400-2940÷28×27
=5400-105×27
=5400-2835
=2565；
（2）（20.2×40%+7.88）÷4.2
=（20.2×0.4+7.88）÷4.2
=（8.08+7.88）÷4.2
=15.96÷4.2
=3.8；
（3）（
+
）÷
+
=
×
+
=
+
=
；
（4）10÷[2.6-（
÷
+
）]
=10÷[2.6-（
×
+
）]
=10÷[2.6-（2+0.4）]
=10÷[2.6-2.4]
=10÷0.2
=50．
=5400-105×27
=5400-2835
=2565；
（2）（20.2×40%+7.88）÷4.2
=（20.2×0.4+7.88）÷4.2
=（8.08+7.88）÷4.2
=15.96÷4.2
=3.8；
（3）（
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
=
| 21 |
| 20 |
| 3 |
| 7 |
| 7 |
| 10 |
=
| 9 |
| 20 |
| 7 |
| 10 |
=
| 23 |
| 20 |
（4）10÷[2.6-（
| 5 |
| 13 |
| 5 |
| 26 |
| 2 |
| 5 |
=10÷[2.6-（
| 5 |
| 13 |
| 26 |
| 5 |
| 2 |
| 5 |
=10÷[2.6-（2+0.4）]
=10÷[2.6-2.4]
=10÷0.2
=50．
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