• 1. (2022五上·微山期末) 计算下面各题，能简算的要简算

  ①12.5×4.8

  ②28.5÷15×5.6

  ③21÷0.25÷0.4

  ④0.55×5.6+0.45×5.6

  ⑤24.6×18-24.6×8.

  ⑥20.9+8.5÷(5.2-3.5)