① ÷[( - )× ]
②15.28-3.99-9.01
③ × - ÷4
①7.4﹣6.62+20.6﹣13.38
②×+×
③(-+)÷
④2×0.8×12.5×50%
⑤÷(÷+)
⑥×[1÷(+)]