log5x - 2log5y + log5z = log5x - log5(y2) + log5z
= log5(x/y2) + log5z
= log5[(xz)/y2]
log2(5A3/(MN)) = log2(5A3) - log2(MN)
= log25 + log2(A3) - (log2M + log2N)
= log25 + 3log2A - log2M - log2N