a: A=-2^3*1/4+2*2^2*1/32-1/2*2*1/2
=-2+1/4-1/2
=-9/4
b: \(B=y^4\left(y^8+x^5y-100x^4\right)+100y^2\left(x^3-x^2\right)+100xy-6\)
=0+0+0-6=-6
c: \(C=-\dfrac{1}{2}\cdot\left(-\sqrt{3}\right)^2+25\cdot\dfrac{-1}{2}\cdot2-\sqrt{3}\cdot\dfrac{-1}{2}\cdot\left(-\sqrt{3}\right)\cdot8\)
=-3/2-25-4
=-3/2-29
=-30,5