选择合理的方法计算下列各题．①517+1905÷15-629； &nbs...
选择合理的方法计算下列各题．①517+1905÷15-629；②435-1.25-0.75+0.4；③4.75×25+5.25÷2.5；④（57-23）÷521×5．...
选择合理的方法计算下列各题．①517+1905÷15-629； ②435-1.25-0.75+0.4；③4.75×25+5.25÷2.5； ④（57-23）÷521×5．
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①517+1905÷15-629
=517+127-629
=644-629
=15
②4
-1.25-0.75+0.4
=4.6-1.25-0.75+0.4
=（4.6+0.4）-（1.25+0.75）
=5-2
=3
③4.75×
+5.25÷2.5
=4.75×
+5.25÷
=4.75×
+5.25×
=（4.75+5.25）×
=10×
=4
④（
-
）÷
×5
=（
-
）×（
×5）
=（
-
）×21
=
×21-
×21
=15-14
=1
=517+127-629
=644-629
=15
②4
| 3 |
| 5 |
=4.6-1.25-0.75+0.4
=（4.6+0.4）-（1.25+0.75）
=5-2
=3
③4.75×
| 2 |
| 5 |
=4.75×
| 2 |
| 5 |
| 5 |
| 2 |
=4.75×
| 2 |
| 5 |
| 2 |
| 5 |
=（4.75+5.25）×
| 2 |
| 5 |
=10×
| 2 |
| 5 |
=4
④（
| 5 |
| 7 |
| 2 |
| 3 |
| 5 |
| 21 |
=（
| 5 |
| 7 |
| 2 |
| 3 |
| 21 |
| 5 |
=（
| 5 |
| 7 |
| 2 |
| 3 |
=
| 5 |
| 7 |
| 2 |
| 3 |
=15-14
=1
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