Найдите корень уравнения: 1) 9 (х-1) = х+15.2) (11 х+14) - (5 х-8) = 25 3) 12-4 (х-3) = 39-9 х 4) - 3 (4-5 у) + 2 (3-6 у) = - 3,9

9 (x-1) = x+15 (11x+14) - (5x-8) = 25 12-4 (x-3) = 39-9x - 3 (4-5y) + 2 (3-6y) = - 3,9

9x-9=x+15 11x+14-5x+8=25 12-4x+12=39-9x - 12+15y+6-12y=-3,9

8x=24 6x=3 5x=15 3y=2,1

x=3 x=0.5 x=3 y=0,7

9 * (x-1) = x+15

9*x-9-x-15=0

8*x-9-15=0

8*x-24=0

x=24/8=3.

11*x+14 - (5*x-8) = 25

6*x+14+8-25=0

6*x-3=0

x=3/6=1/2~~0.5.

12-4 (х-3) = 39-9 х

24-4*x-39+9*x=0

-15+5*x=0

x=15/5=3.

-3 (4-5 у) + 2 (3-6 у) = - 3,9

-6+15*y-12*y+3.9=0

-6+3*y+39/10=0

-21/10+3*y=0

y=21/10/3=7/10~~0.7.