b) = [(-1) x 4 ] : [(-1) x 1/16 ] = ( -1) x 4 x (-1) x 16 = 64
c) = [(-1) x 3/25 ] : 5 = (-1) x 3/25 x 1/5 = - 3/125
d) = [(-1) x 1/6 ] : [(-1) x 2/3 = ( -1) x 1/6 x ( -1) x 3/2 = 3/12 = 1/4
e) = [(-1) x 4/25 ] : 8/15 = ( -1) x 4/25 x 15/8 = - 3/10
f) = 7/8 : [(-1) x 21/4 ] = 7/8 x ( -1) x 4/21 = - 1/6
g) = [(-1) x 8] : [(-1) x 4/5] = ( -1) x8 x ( -1) x 5/4 = 10