0,a平方加b平方等于4ab,则a-b分子b+b的值等于?,

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[(a+b)/(a-b)]^2 =(a^2+b^2+2ab)/(a^2+b^2-2ab) =(4ab+2ab)/(4ab-2ab) =6ab/2ab =3 (a+b)/(a-b)=√3