(i) -8/27xyz (3/2xyz2 – 9/4xy2z3)
= -8/27xyz (3/2xyz2 – 9/4xy2z3)
= (-8/27xyz × 3/2xyz2) – (-8/27xyz × 9/4xy2z3)
= -4/9x2y2z3 + 2/3x2y3z4
(ii) -4/27xyz (9/2x2yz – 3/4xyz2)
= -4/27xyz (9/2x2yz – 3/4xyz2)
= (-4/27xyz × 9/2x2yz) – (-4/27xyz × 3/4xyz2)
= -2/3x3y2z2 + 1/9x2y2z3
(iii) 1.5x (10x2y – 100xy2)
= 1.5x (10x2y – 100xy2)
= (1.5x 10x2y) – (1.5x × 100xy2)
= 15x3y – 150x2y2
