• 1. (2021五上·沽源期中) 脱式计算，能简便的要简便计算

  ①6.17×3.6+6.17×6.4

  ②0.25×0.39×4

  ③4.7×102-47×0.2

  ④9.07-8.5+3.4

  ⑤15.6+18.9÷1.4

  ⑥3.79+0.125÷0.8