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奥数天天练，小升初必会真题，教孩子巧设未知数10分轻松拿到手
09-2列方程解应用题：有四个数，从中每次取出三个数相加，得到的四个和分别为22、24、27、20，求这四个数各是多少？当然，不用方程也能解，你会吗？
小学奥数提分天天练28/65
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