Tính nhanh:

a. A= (-1)2n^{2n}.(-1)n^n.(-1)n+1^{n+1} (n\inN)

b. B=(10000-12^2).(10000-22^2)-(10000-10002^2)

c.C=(1125\dfrac{1}{125}-113\dfrac{1}{1^3})((1125\dfrac{1}{125}-123\dfrac{1}{2^3})...(1125\dfrac{1}{125}-1253\dfrac{1}{25^3})

d.D=1999(100013)(100023)...(1000103)^{\left(1000-1^3\right)\left(1000-2^3\right)...\left(1000-10^3\right)}

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