两道文字题+三道应用题文字题:5.2加上0.8的和乘0.9减去0.6的差,积是多少?一个数的2.3倍与0.54的和是1,求这个数应用题:(全部用方程做)小君和爸爸的年龄之和是42岁,年龄之差是26岁,小巧和爸爸今

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