脱式计算（能简算的要简算） （1）6.72-2.3÷0.5×0.8 （2）98-17+18-67（3）910÷[12×（65-310）]（4）（27+15）×7×5．
（1）6.72-2.3÷0.5×0.8
=6.72-4.6×0.8
=6.72-3.68
=3.04；
（2）
-
+
-
=（
+
）-（
+
）
=
-1
=
；
（3）
÷[
×（
-
）]
=
÷[
×
]
=
÷
=2；
（4）（
+
）×7×5
=
×7×5+
×7×5
=10+7
=17．
=6.72-4.6×0.8
=6.72-3.68
=3.04；
（2）
| 9 |
| 8 |
| 1 |
| 7 |
| 1 |
| 8 |
| 6 |
| 7 |
=（
| 9 |
| 8 |
| 1 |
| 8 |
| 1 |
| 7 |
| 6 |
| 7 |
=
| 5 |
| 4 |
=
| 1 |
| 4 |
（3）
| 9 |
| 10 |
| 1 |
| 2 |
| 6 |
| 5 |
| 3 |
| 10 |
=
| 9 |
| 10 |
| 1 |
| 2 |
| 9 |
| 10 |
=
| 9 |
| 10 |
| 9 |
| 20 |
=2；
（4）（
| 2 |
| 7 |
| 1 |
| 5 |
=
| 2 |
| 7 |
| 1 |
| 5 |
=10+7
=17．
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