脱式计算．（1）8470﹣104×65（2）168.1÷（4.3×2﹣0.4）（3）（+）÷+（4）1110÷[56×（﹣）]．
直接写得数．+=﹣= 0.2﹣=+=﹣=+2÷9= 2﹣﹣= 1.55﹣= 1﹣﹣+= 0.5﹣﹣=
计算．===== 1﹣===
看图计算下面各题．+= +=
计算下列各题：========
观察下面各式，算一算，你能发现什么规律？+=+=+=×=×=×=
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