1)Розвяжить ривняння; 2 1/3(x-3 1|2)=8 5/9.

2 1/3( x - 3 1/2 ) = 8 5/9 
7/3( x - 7/2 ) = 77/9 
x - 7/2 = 77/9 : 7/3 
x - 3 1/2 = 11/3 
x = 3 2/3 + 3 1/2
x = 3 4/6 + 3 3/6 
x = 6 7/6 
x = 7 1/6

2 1/3(х-3 1/2)=8 5/9
7/3(х-7/2)=8 5/9
7/3х-49/6=8 5/9
7/3х=8 5/9+8 1/6
7/3х=8 10/18+8 3/18
7/3х=16 13/18
7/3х=301/18
х=301/18:7/3
х=43/6
х=7 1/6