Question

-3(5x-3y)-4(-2x+6y) якщо x=-2 y=0,1

-9(3x-7y)-8(11x-2y),якщо x=0,02,y= -12
13

Answer 1

1)

$- 3(5x - 3y) - 4( - 2x + 6y) = \\ - 15x + 9y + 8x - 24y = \\ - 7x - 15y = - 7 \times ( - 2) - 15 \times 0.1 = \\ 14 - 1.5 = 12.5$

2)

$- 9(3x - 7y) - 8(11x - 2y) = \\ - 7x + 63y - 88x + 16y = \\ 79y- 95x = \\ 79 \times ( - 12) - 95 \times 0.02 = \\ - 948 -1 .9 = - 949.9$