a+ b分之a² a b分之b² 2ab=?
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a+ b分之a² a b分之b² 2ab=?
a+ b分之a² a b分之b² 2ab=?
a+ b分之a² a b分之b² 2ab=?
a+ b分之a² a b分之b² 2ab
=(a²+b²+2ab)/(a+b)
=(a+b)²/(a+b)
=a+b
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