题目内容
①45×8-240÷15
②（2.5-2.5×0.6）÷0.4
③41.2-9.5×1.8÷0.45
④（
+
-
）×72
⑤
÷
-
×6
⑥
÷[（
-
）×12]．
②（2.5-2.5×0.6）÷0.4
③41.2-9.5×1.8÷0.45
④（
| 1 |
| 4 |
| 1 |
| 9 |
| 1 |
| 12 |
⑤
| 8 |
| 15 |
| 1 |
| 6 |
| 7 |
| 15 |
⑥
| 7 |
| 10 |
| 3 |
| 5 |
| 1 |
| 4 |
①45×8-240÷15，
=360-16，
=344；
②（2.5-2.5×0.6）÷0.4，
=（2.5-1.5）÷0.4
=1÷0.4，
=2.5；
③41.2-9.5×1.8÷0.45，
=41.2-17.1÷0.45，
=41.2-38，
=3.2；
④（
+
-
）×72，
=
×72+
×72-
×72，
=18+8-6，
=26-6，
=20；
⑤
÷
-
×6，
=
×6+
×6，
=（
+
）×6，
=1×6，
=6；
⑥
÷[（
-
）×12]，
=
÷[
×12]，
=
÷
，
=
×
，
=
．
=360-16，
=344；
②（2.5-2.5×0.6）÷0.4，
=（2.5-1.5）÷0.4
=1÷0.4，
=2.5；
③41.2-9.5×1.8÷0.45，
=41.2-17.1÷0.45，
=41.2-38，
=3.2；
④（
| 1 |
| 4 |
| 1 |
| 9 |
| 1 |
| 12 |
=
| 1 |
| 4 |
| 1 |
| 9 |
| 1 |
| 12 |
=18+8-6，
=26-6，
=20；
⑤
| 8 |
| 15 |
| 1 |
| 6 |
| 7 |
| 15 |
=
| 8 |
| 15 |
| 7 |
| 15 |
=（
| 8 |
| 15 |
| 7 |
| 15 |
=1×6，
=6；
⑥
| 7 |
| 10 |
| 3 |
| 5 |
| 1 |
| 4 |
=
| 7 |
| 10 |
| 7 |
| 20 |
=
| 7 |
| 10 |
| 21 |
| 5 |
=
| 7 |
| 10 |
| 5 |
| 21 |
=
| 1 |
| 6 |
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