①
②1.25×1.3×80
③7.28-3.14+1.72-2.86
④
⑤
⑥
①7.4﹣6.62+20.6﹣13.38
②×+×
③(-+)÷
④2×0.8×12.5×50%
⑤÷(÷+)
⑥×[1÷(+)]