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1114a-2b=3(a-b)+(a+b)32所以3+25

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1<=a-b<=2,2<=a+b<=4求t=4a-2b范围

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4a-2b=3(a-b)+(a+b)
3<=3(a-b)<=6
2<=a+b<=4
所以3+2<=t<=6+4
5<=t<=10

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