已知a+b=2,ab=1.求a²+b²、(a-b)²的值
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已知a+b=2,ab=1.求a²+b²、(a-b)²的值
已知a+b=2,ab=1.求a²+b²、(a-b)²的值
已知a+b=2,ab=1.求a²+b²、(a-b)²的值
a+b=2,ab=1.求a²+b²、(a-b)²的值
a²+b²=(a+b)^2-2ab=2
(a-b)²=(a+b)^2-4ab=0
(a+b)2=a2+b2+2ab=a2+b2+2=4
a2+b2=2
(a-b)2=a2+b2-2ab=2-2=0