• 1. (2020五上·兰山期中) 用简便方法计算。

  ①0.25×7.41×40

  ②3.48×22.9+3.48×77.1

  ③3.5×10.1

  ④43.6×101-43.6

  ⑤（3.2+0.56）÷0.8

  ⑥32×2.5×12.5