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x(x+1)(3x+4y)=144① x²;+4x+4y=24② 由②得4y=24-x²;-4x代入①得 (x²;+x)(3x+24-x²;-4x)=144 (x²;+x-12)²;=0 x²;+x-12=0 (x+4)(x-3)=0 解得:x=-4 y==6 或x=3 y=3/4
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