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]=．
直接写得数．
3.86+2.4=7.6﹣0.56=4.5×102=3.25+2.3+1.75=
361+199=7÷0.4=4
=
=
2.5×32=
=0.1÷0.01=3.47﹣（2.5+0.47）=
4768÷791≈12÷
=1÷
=
=5.58÷0.78≈
4.98×7.11≈
=
=
用你最喜欢的方法计算．
1.25×0.25×32
（0.25+
）÷（
﹣
）
×0.25+
×
[（8.7﹣7.5）÷0.2]×0.15
3.75×58.3÷58.3×6.54÷3.75÷65.4
56×（
+
﹣
）
简算下列各题
548+468+529.14﹣1.34﹣4.5777+2.7+2.3+23
3200÷4÷25125×32×252009×95+5×2009．
0.4×99+0.4．