反複應用 (a+b)^2>= 4ab
左邊=((1+xy+x+y)^2)^2>= (4(1+xy)(x+y))^2=16(x+y)^2(1+xy)^2>= 右邊
左邊=((1+xy+x+y)^2)^2>= (4(1+xy)(x+y))^2=16(x+y)^2(1+xy)^2>= 右邊
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