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]=．
+
﹣
+
+
+
﹣
﹣（
+
）
﹣
=
+
=
﹣
=
﹣
=
+
=
﹣
= 1﹣
=
﹣
﹣
=
+
=
+
+
+
．
+
=
+
=
﹣
﹣
=
=
+
﹣
=
+
．
=
=
=
=
= 1﹣
=
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