• 1. (2022五上·科尔沁左翼中旗) 脱式计算，能简算的要简算哦！

  ①2.5×3.8×0.4

  ②3.47×12.4-3.47×2.4

  ③0.49×101

  ④0.125×32

  ⑤27.9×99+27.9

  ⑥4.53+5.47×0.4