(-12b3)(8b2) 2) (7a5b3c)(-3ab4c) 3 ) (-32a3xy3)34ax2y) 4)

1) (-1/2b2)(8b2) = -b16b= -16b

2) (7a5b3c)(-3ab4c) = 75abc (- 12abc) = -900abc

3) ( -3/2a 3xy3) 3/4ax2y = - 27/2axy 3/2axy = -81/4 axy = 20,25axy

4) ( -18n)( -1/6m2)( -5mn) = -18n ( - 1/3m)( -5nm) = 6mn ( -5mn) = -30mn

5) ( -5ab 2c)( -0,4abc3) = -10abc ( - 1.2abc) = 12abc