①856+97
②8.32×101-8.32
③7.5÷ -
④56×( + - )
⑤ ÷[ ×( + )]
⑥22.4-2.3-5.7
45÷[(0.5+)÷12] 12.5×(0.8×8) 2.25×1.8+12.5×0.18