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x+2.2x=480所以3.2x=480 x=480/3.2=150
(20+2x)(30+2x)=3000 =>4x^2+100x+600=3000 =>4x^2+100x-2400=0 =>x^2+25x-600=0 =>(x-15)(x+40)=0 x1=15 x2=-40
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