题目内容
| 脱式计算． ①12-2÷7-
| ②4.2×25%+
| ③68÷[0.5×（7.5-0.7）] | ④
|
①12-2÷7-
，
=12-2×
-
，
=12-
-
，
=12-（
+
），
=12-1，
=11；
②4.2×25%+
×
，
=（4.2+0.8）×0.25，
=5×0.25，
=1.25；
④
-[1.2×（
-
）]，
=
-[1.2×
-1.2×
]，
=
-[0.9-0.7]，
=0.2-0.2，
=0．
| 5 |
| 7 |
=12-2×
| 1 |
| 7 |
| 5 |
| 7 |
=12-
| 2 |
| 7 |
| 5 |
| 7 |
=12-（
| 2 |
| 7 |
| 5 |
| 7 |
=12-1，
=11；
②4.2×25%+
| 4 |
| 5 |
| 1 |
| 4 |
=（4.2+0.8）×0.25，
=5×0.25，
=1.25；
④
| 1 |
| 5 |
| 3 |
| 4 |
| 7 |
| 12 |
=
| 1 |
| 5 |
| 3 |
| 4 |
| 7 |
| 12 |
=
| 1 |
| 5 |
=0.2-0.2，
=0．
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