(x-3).(x+3)-(x+5).(x-1)

Bất đẳng thức đáng nhớ rồi phá cái bên cạnh ra là dc

Let the blue-eyed student set is B Let the blonde student set is C
P(B)=0.3
P(BC)=0.2
P(B′C′)=0.5

Therefore, the answer is B. 0.2.

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