Question

已知A加B等于负2,AB等于2分之1,求根号A分之B加根号B分之A的值

Answer 1

A+B=-2;
AB=1/2;
√(B/A)+√(A/B)
=√(AB)/A+√(AB)/B
=-√(1/2)/A-√(1/2)/B
=√(1/2)(-B-A)/(AB)
=√(1/2)(2)/(1/2)
=4×√2/2
=2√2;
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