①7.4﹣6.62+20.6﹣13.38
②×+×
③(-+)÷
④2×0.8×12.5×50%
⑤÷(÷+)
⑥×[1÷(+)]
4.2﹣1.38+5.8﹣3.62
×16.31﹣2.31÷
(+)×4+
÷[(+)×]
7.63﹣2.8+1.37
4.5×8×1.25
6.4×+3.6×
1.7+3.98+5.3+2.02 (156×-26)× ×16-2÷