题目内容
| 用递等式计算． ①7680-4680÷12×5 | ②53×26+470×2.6 | ③7.5÷（4-3.75）×4 | |||||||||||
④
| ⑤[
|
①7680-4680÷12×5，
=7680-390×5，
=7680-1950，
=5730；
②53×26+470×2.6，
=530×2.6+470×2.6，
=（530+470）×2.6，
=1000×2.6，
=2600；
③7.5÷（4-3.75）×4，
=7.5÷0.25×4，
=30×4，
=120；
④
÷
×
，
=
×
×
，
=
×
，
=3；
⑤[
+（
-
）]×45，
=[
+
]×45，
=
×45+
×45，
=9+5，
=14．
=7680-390×5，
=7680-1950，
=5730；
②53×26+470×2.6，
=530×2.6+470×2.6，
=（530+470）×2.6，
=1000×2.6，
=2600；
③7.5÷（4-3.75）×4，
=7.5÷0.25×4，
=30×4，
=120；
④
| 5 |
| 7 |
| 2 |
| 9 |
| 14 |
| 15 |
=
| 5 |
| 7 |
| 9 |
| 2 |
| 14 |
| 15 |
=
| 45 |
| 14 |
| 14 |
| 15 |
=3；
⑤[
| 3 |
| 5 |
| 4 |
| 9 |
| 1 |
| 3 |
=[
| 3 |
| 5 |
| 1 |
| 9 |
=
| 1 |
| 5 |
| 1 |
| 9 |
=9+5，
=14．
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