把21.22.23.24.25.26.27.28.29填入方框内,使横.竖.斜相加都得75

问题描述:

把21.22.23.24.25.26.27.28.29填入方框内,使横.竖.斜相加都得75
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26 21 28
27 25 23
22 29 24