计算下面各题（能简算的要简算）．
①4×0.8×2.5×12.5 ②
÷[1﹣（
+
）] ③（2.8+3.85÷3.5）×4.6
④6.5×1.83+0.17×6.5 ⑤（
+
）×8+
⑥
÷[
×（0.4+
）]．
计算下面各题（能简算的要简算）．
①4×0.8×2.5×12.5 ②÷[1﹣（+）] ③（2.8+3.85÷3.5）×4.6
④6.5×1.83+0.17×6.5 ⑤（+）×8+ ⑥÷[×（0.4+）]．
×12+
÷
+
+
÷[（
+
）×
]．
×7+
×99+
．
+
﹣
②1
﹣
﹣
+
③
﹣（
+
）
﹣
⑤
﹣（
﹣
）⑥
+1
+0.4﹣
+
）×29×23= ，
÷7+
×
= ，
= ．
÷0.2×
+（
）÷
﹣（
﹣
）]÷
．
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