1) 8/c*d/14 = 8d/14c = 4d/7c
2) 4x/y*y/12x = 3/4
3) 12x^5/25 * 15/8x^2 = 3x^3/5 * 3/2 = 9x^3/10
4) 1/9x^3*3x/2a^2 = 1/6a^2x
5) 8c/21d^2 * 7d/6c^2 = 4/9cd
6) 4x^2/3y * 1/8x = x/6y
7) 2m^3/35a^3b^3 * 7a^2b/6m^3 = 1 / 15ab
8) 4m^4/n^3 * n^5/2m^6 = 2n^2 / m^2
9) 7p^4/10q^3 * 5q/14p^2 * 4q^4/3p = 2p*q^2 / 6 = p*q^2 / 3