Question

(СРОЧНО)Решите уравнения
0,2*(х + 4) = 0,6 + 0,3 (х-2)
-3*(2,1х-1)+4,8=-6,7х+9,4
4,37+6,7x=7,75+9,3х

Answer 1

$0.2(x + 4) = 0.6 + 0.3(x - 2) \\ 0.2x + 0.8 = 0.6 + 0.3x - 0.6 \\ 0.2x - 0.3x = 0.6 - 0.6 - 0.8 \\ - 0.1x = - 0.8 \\ x = - 8 \\ - 3(2.1x - 1) + 4.8 = - 6.7x + 9 .4 \\ - 6.3x + 3 + 4.8 = - 6.7x + 9.4 \\ - 6.3x + 6.7x = 9.4 - 3 - 4.8 \\ 0.4x = 1.6 \\ x = 4 \\ 4.37 + 6.7x = 7.75 + 9.3x \\ 6.7x - 9.3x = 7.75 - 4.37 \\ - 2.6x = 3.38 \\ x = - 1.3$