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]=．
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]=．
+
=
×10%= 3.6÷12= 80%×80%=
×4÷
×4= 15÷1%=
﹣
+
+
=（
+
﹣
）×21= 2.5×9×4=
．
﹣
+
﹣
+
﹣
．
﹣
+
．
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