①#(-)÷
②# 8.8-6.75+9.2-0.25
③÷(-)×
④÷[(-)×)]
① +( + )
②3- -
③ - + -
④ - +
⑤ -( + )-
⑥11+14+17+20+23+26+29
①14.56﹣6.62+5.44﹣8.38
②×0.8×12.5
③5.9×63+59×3.7
④÷[×(﹣)]