涂色表示下面小数． 0.4 1.6．
直接写得数．﹣=+=+=+=﹣=﹣=﹣=+= 1﹣=﹣=．
计算下面各题．+﹣+++﹣﹣（+）
﹣=+=﹣=﹣=+=﹣= 1﹣=﹣=﹣=+=
+++．
递等式计算+=+=﹣=﹣= 1﹣=+﹣= 1﹣+．
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．
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