直接写得数．2.2+3.8= 7﹣6.83= 4.8×0.5= 2.42÷1=0.37×1000= 5×0÷36= 98×0.2+98×1.8= 100﹣7.3﹣2.7=
口算．﹣=+= 2﹣=+=﹣=﹣=++= 1﹣﹣=﹣+= 5﹣﹣=
直接写得数. 7.2÷9=﹣=+=﹣+= 5﹣=﹣×0=
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直接写得数．========
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