"鸡兔同笼"类的问题该怎样解?公式是什么?例:1.小明有5.1元,其中只有1角和5角,共27枚,求1角和5角各几个?2.甲工程队每天修0.5千米,乙队则修0.4千米,现在要修1.7千米的路,4天完成(不多也不少),那

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