题目内容
| 用自己喜欢的方法计算． 205-105×12÷45 | 1.05×（3.8-0.8）÷6.3 | （
| ||||||||
（
| 884÷34+17×21 | 3.75×（1.2-
|
①205-105×12÷45，
=205-105×12÷45，
=205-1260÷45，
=205-28，
=177；
②1.05×（3.8-0.8）÷6.3，
=1.05×3÷6.3，
=3.15÷6.3，
=0.5；
③（
+
）÷
，
=（
+
）÷
，
=
÷
，
=
×
，
=
；
④（
+
）÷50%，
=（
+
）÷
，
=
×2，
=1
；
⑤884÷34+17×21，
=26+357，
=383；
⑥3.75×（1.2-
）+
，
=3.75×（
-
）+
，
=3.75×
-3.75×
+
，
=4.5-1.25+0.75，
=4．
=205-105×12÷45，
=205-1260÷45，
=205-28，
=177；
②1.05×（3.8-0.8）÷6.3，
=1.05×3÷6.3，
=3.15÷6.3，
=0.5；
③（
| 1 |
| 5 |
| 1 |
| 3 |
| 8 |
| 9 |
=（
| 3 |
| 15 |
| 5 |
| 15 |
| 8 |
| 9 |
=
| 8 |
| 15 |
| 8 |
| 9 |
=
| 8 |
| 15 |
| 9 |
| 8 |
=
| 3 |
| 5 |
④（
| 1 |
| 2 |
| 1 |
| 4 |
=（
| 2 |
| 4 |
| 1 |
| 4 |
| 1 |
| 2 |
=
| 3 |
| 4 |
=1
| 1 |
| 2 |
⑤884÷34+17×21，
=26+357，
=383；
⑥3.75×（1.2-
| 1 |
| 3 |
| 3 |
| 4 |
=3.75×（
| 6 |
| 5 |
| 1 |
| 3 |
| 3 |
| 4 |
=3.75×
| 6 |
| 5 |
| 1 |
| 3 |
| 3 |
| 4 |
=4.5-1.25+0.75，
=4．
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