找朋友，连一连．90÷3 360÷6 160÷2180÷3 720÷9 180÷6．
直接写出得数．+=+=++=﹣（﹣）= 3﹣=﹣=（﹣）×0= 5﹣﹣3=
用你喜欢的方法计算．+﹣+﹣ 5﹣﹣．
怎样简便怎样算．++=+++=﹣（+）=
．
﹣=+=+=﹣=﹣=﹣=+=﹣= 1﹣﹣=+=
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