①
②
③
④
⑤
⑥
①4.25÷2.5÷0.4
②72.5-2.07÷23
③5.04×(4.32÷1.2)
④12.8÷(2.4+1.6×2.5)
⑤16.8÷0.12÷7
⑥2.6×4-2.5