题目内容
| 用简便方法计算 ①（
| ②74×
|
①（
-
+
）÷
，
=（
-
+
）×30，
=
×30-
×30+
×30，
=21-5+12，
=16+12，
=28；
②74×
+2.6×3.6，
=74×0.36+2.6×3.6，
=7.4×3.6+2.6×3.6，
=（7.4+2.6）×3.6，
=10×3.6，
=36．
| 7 |
| 10 |
| 1 |
| 6 |
| 2 |
| 5 |
| 1 |
| 30 |
=（
| 7 |
| 10 |
| 1 |
| 6 |
| 2 |
| 5 |
=
| 7 |
| 10 |
| 1 |
| 6 |
| 2 |
| 5 |
=21-5+12，
=16+12，
=28；
②74×
| 9 |
| 25 |
=74×0.36+2.6×3.6，
=7.4×3.6+2.6×3.6，
=（7.4+2.6）×3.6，
=10×3.6，
=36．
练习册系列答案
相关题目