下面各题，怎样算简便就怎样算．
①1080+270÷18﹣864 ②7.54+
+2.46+
③（2.4﹣
）÷0.625+
④2.5×12.5×40×0.8 ⑤98.9×99+98.9 ⑥40.5÷
×[（1﹣）×1.2]．
下面各题，怎样算简便就怎样算．
①1080+270÷18﹣864 ②7.54++2.46+ ③（2.4﹣）÷0.625+
④2.5×12.5×40×0.8 ⑤98.9×99+98.9 ⑥40.5÷×[（1﹣）×1.2]．
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