Решить уравнения 3 х+0,8//9,6=4,8//3,6; 5x+3//9=27//13,5; 8//20=28//9x+7

3 х+0.8/9.6=4.8/3.6

3.6 * (3 х+0.8) = 9.6*4.8

10.8 х+2.88=46.08

10.8 х=46.08-2.88

10.8 х=43.2

х=43.2:10.8

х=4

5 х+3/9=27/13.5

13.5 * (5 х+3) = 9*27

67.5 х+40.5=243

67.5 х=243-40.5

67.5 х=202.5

х=202.5:67.5

х=3

8/20=28/9 х+7

8 * (9 х+7) = 20*28

72 х+56=560

72 х=560-56

72 х=504

х=504:72

х=7