Question

-3х*(-3). - 2*0,5х. 4m*(-0,25)*n.

Answer 1

$- 3x \times ( - 3) = 9x \\ - - - - - - - - \\ - 2 \times 0.5x = 1x = x \\ - - - - - - - - - \\ 4m \times ( - 0.25) \times n = \\ = - 1m \times n = - mn$