Given that ABCD is a positive real number and a / b > C / D, then M = B / A + B - D / C + D is a.m > 0 B.M ≥ 0 C.M

Given that ABCD is a positive real number and a / b > C / D, then M = B / A + B - D / C + D is a.m > 0 B.M ≥ 0 C.M

Choose C
If a / b > C / D, ad > BC, B / A + B-D / C + D, the denominator of the two terms is reduced to
Re simplification of (BC + BD) / (a + b) * (c + D) - (DA + BD) / (a + b) * (c + D)
（bc-ad）/（a+b）*（c+d）
The numerator of ∵ BC ∵ ad ∵ is less than 0 and the denominator is greater than 0
So choose C

Elden Ring Premiere

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