脱式计算，写出主要计算过程，能用简便算法的要用简便算法．
①1375+450÷18 ②2.84+5.6﹣0.84+4.4 ③（20.1﹣21×
）÷7
④
⑤2﹣
÷
﹣
⑥
×[
﹣（
﹣
）]．
脱式计算，写出主要计算过程，能用简便算法的要用简便算法．
①1375+450÷18 ②2.84+5.6﹣0.84+4.4 ③（20.1﹣21×）÷7
④ ⑤2﹣÷﹣ ⑥×[﹣（﹣）]．
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