15 целых 1/13*(1,9х + 5,7) = 0
15 1/13 * 1,9х + 15 1/13 * 5,7 =0
57/26 х + 171/26=0
57/26х = 0 - 171/26
57/26х = - 171/26
х = - 171/26 ÷ 57/26
х = -3
<span>arcsin(-1/2)+arctg(sqr3/3)= -пи/6 + пи/6=0</span>
24 - 0,3
x - 1
x/24=1/0.3
x=24/0,3=80
110/330=55/165=11/33=1/3
1456/1560=728/780=364/390=182/195
212/318=106/159
14/16=7/8