8-x>=0, x<=8
49+7x>0, 7x>-49, x>-7
x€(-7;8]
Тангенс угла АОВ равен 3/4 или 0,75
2 1/6 и 3 1/9 = 2 3/18 u 3 2/18
4 2/7 и 5 4/21 = 4 6/21 u 5 4/21
1 3/11 и 2 1/2 = 1 6/22 u 2 11/22
2 8/15 и 1 5/12 = 2 32/60 u 1 25/60
Х-1 2/9=2 5/19
x=2 5/19+1 2/9
x=43/19+11/9
x=387/171+209/171
x=596/171=3 83/171
<span>х : 9 = 14 : 3
</span>3х=14*9
3х=126
х=126:3
х=42