Question

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

Answer 1

3х+0.89.6=4.83.6
3.6*(3х+0.8)=9.6*4.8
10.8х+2.88=46.08
10.8х=46.08-2.88
10.8х=43.2
х=43.2:10.8
х=4

5х+39=2713.5
13.5*(5х+3)=9*27
67.5х+40.5=243
67.5х=243-40.5
67.5х=202.5
х=202.5:67.5
х=3

820=289х+7
8*(9х+7)=20*28
72х+56=560
72х=560-56
72х=504
х=504:72
х=7