(100-12)*(100-12)*(200-12)
(90-2)(90-2)(100+90-2)
=100x(90-2)^2+(90-2)^3
=100x(8100-2x2x90+4)+(729000-3x8100x2+3x90x4-8)
=100x(8100-360+4)+(729000–48600+1080-8)
=810000-36000+400+729000-48600+1080-8
=810000+729000+400+1080-48600-36000-8
=1540480-48600-36000-8
=1455872