已知a2+bc=6，b2﹣2bc=﹣7．则5a2+4b2﹣3bc的值是

题干

已知a²+bc=6，b²﹣2bc=﹣7．则5a²+4b²﹣3bc的值是（　　）

A：3

B：2

C：1

D：0

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Amy：Who's that ____ (bay boy)?

Chen Jie: He's ____ (me my) brother.

Amy: Is she ____ (you your) mother?

Chen Jie: Yes , ____ (She she ) is.

Amy: Is he ____ (you your) father?

Chen Jie: No, he isn't. ____ (he's He's ) my teacher!

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