数学思维3X+(5X+1500)+(7X+1500)+(6X+1500)+(7X+1500)+(7X+1500)+(7X+1500)=22000
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数学思维3X+(5X+1500)+(7X+1500)+(6X+1500)+(7X+1500)+(7X+1500)+(7X+1500)=22000
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