支持藍方: W₂=2a₂+2M/5y P₂=a₂-b₂+2M/5y (a₂≥0,b₂≥300,a₂+b₂=n) 令P₁<P₂得,2/5y - 3/5x > 2(a₁-a₂)/M 令A = 2(a₁-a₂)/M,得2x/(5Ax+3) > y
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