6 КЛАСС №826 Найдите корни уравнений. 1) 1,2d-0,5 (4d-1) = - 0,7 (d-2) 2) 3,1 (1-3t) + t=0,4 (t-14)

1) 1,2d-0,5 (4d-1) = - 0,7 (d-2)

1,2d-0.5*4d-0.5 * (-1) = -0.7*d-0.7 * (-2)

1.2d-2d+0.5=-0.7d+1.4

1.2d-2d+0.7d=1.4-0.5

-0.1d=0.9

d=0.9: (-0.1)

d=-9

2) 3,1 (1-3t) + t=0,4 (t-14)

3.1*1-3.1*3t+t=0.4*t-0.4*14

3.1-9.3t+t=0.4t-5.6

-9.3t+t-0.4t=-5.6-3.1

-8.7t=-8.7

t=-8.7: (-8.7)

t=1