直接写得数6﹣2.4= 18.3+26.7= 15.2﹣4.4=4.7+3.6= 50×20= 20×6=13×20= 120×30= ══ ═ ═
计算下列各题，能简算的要简算，并把主要的计算过程写出来．+﹣=﹣﹣=++= 25×0.25×3.2= 6﹣（﹣）=﹣++=
直接写得数．+=+=﹣= 1﹣=﹣= 0.25+=+= 2+=+=﹣=
脱式计算，能简算的要简算． 3﹣﹣++﹣+﹣．
①+=②+=③﹣= ④2﹣=⑤+=⑥+=
下面各题怎样算简便就怎样算． 6﹣﹣．
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