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說明a,b是方程x^2-6x+8=0的2根,則a=2,b=4或者a=4,b=2 (a-2b-3)^2=81或者9 a^2+b^2=(a+b)^2-2ab=36-16=20 (a-b)^2=(a+b)^2-4ab=36-32=4
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