①45.55﹣(6.82+15.55)
②27.38﹣5.34+2.62﹣4.66
③4.3×4.3+5.7×4.3
④12.8÷[(22.5﹣6.5)×0.5]
⑤26.7﹣0.5×0.5﹣0.75
⑥7.75×[20÷(3.24﹣3.04)]