计算:①+﹣= ②3.2﹣0.85﹣1= ③3.2×﹣÷2= ④1.725×4×0.5=⑤(+)÷= ⑥1.8×0.72+1.28×1.8= ⑦2÷(﹣)= ⑧57.6÷[(1.25+25%)×0.32]=.