巧克力与奶的质量比是2：9，其中巧克力有1.6千克，一共能调制多少千克巧克力奶？
直接写出得数 ﹣= += += +0.3=﹣= 1﹣= ﹣= 3÷9=
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+=
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