(X) =x2-2x + 2a(a2-2ab-b2)-b(2a2 ab-b2)∴2ab/a b≤2ab/2√ab=√ab m<0,n<0,求(√-m)2 (√-n)2

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(X) =x2-2x + 2a(a2-2ab-b2)-b(2a2 ab-b2)∴2ab/a b≤2ab/2√ab=√ab m<0,n<0,求(√-m)2 (√-n)2
(X) =x2-2x + 2a(a2-2ab-b2)-b(2a2 ab-b2)
∴2ab/a b≤2ab/2√ab=√ab m<0,n<0,求(√-m)2 (√-n)2

(X) =x2-2x + 2a(a2-2ab-b2)-b(2a2 ab-b2)∴2ab/a b≤2ab/2√ab=√ab m<0,n<0,求(√-m)2 (√-n)2
三向量AB、BC、CA构成ABC,AB BC CA=0(m 1)x2-mx m-1>0假设BE=BC CE=BC CA/2;CF=CA AF=CA AB/2假设三向量AB、BC、CA构成ABC,AB BC CA=0