①7.4﹣6.62+20.6﹣13.38
②×+×
③(-+)÷
④2×0.8×12.5×50%
⑤÷(÷+)
⑥×[1÷(+)]
①2.75×6.2+27.5×0.38
②0.125×32×2.5
③15.72-2.17-1.83+4.28
④
⑤
⑥