x2-3ax+2a2=0 x2-(2a+1)x+a(a+1)=0 x2-(2a+1)x+a(a+1)≥0 x2-3ax+
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2个回答

x2-3ax+2a2=0

(x-a)(x-2a)=0

x=a或x=2a

x2-(2a+1)x+a(a+1)=0

(x-a)(x-a-1)=0

x=a或x=a+1

x2-(2a+1)x+a(a+1)≥0

(x-a)(x-a-1)≥0

x≤a或x≥a+1

x2-3ax+2a2<0

(x-a)(x-2a)

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