1) (-1/2b×2)(8b×2) = -b×16b= -16b²
2) (7a×5b×3c)(-3ab×4c) = 75abc × (- 12abc) = -900a²b²c²
3) ( -3/2a × 3xy×3) × 3/4ax×2y = - 27/2axy × 3/2axy = -81/4 axy = 20,25axy
4) ( -18n)( -1/6m×2)( -5mn) = -18n × ( - 1/3m)( -5nm) = 6mn × ( -5mn) = -30m²n²
5) ( -5ab × 2c)( -0,4abc×3) = -10abc × ( - 1.2abc) = 12a²b²c²
1) (-1/2b×2)(8b×2) = -b×16b= -16b²
2) (7a×5b×3c)(-3ab×4c) = 75abc × (- 12abc) = -900a²b²c²
3) ( -3/2a × 3xy×3) × 3/4ax×2y = - 27/2axy × 3/2axy = -81/4 axy = 20,25axy
4) ( -18n)( -1/6m×2)( -5mn) = -18n × ( - 1/3m)( -5nm) = 6mn × ( -5mn) = -30m²n²
5) ( -5ab × 2c)( -0,4abc×3) = -10abc × ( - 1.2abc) = 12a²b²c²