Решите 40 1)1 2/3 х-4/5=2 3/4 2)1/2: (1/3 x-3)=2 1/2 3)1/5: (1/2 x +2)=3 1/5

1)5/3 x=11/4 +4/5  ; 5/3x=71/20 ; x =213/100 =2,13

2)1/2 : (x-9)/3 =5/2 ; 3/2 : (x-9) =5/2 ; 6=10(x-9) ;x= 0,6 +9 = 9,6

3) 1/5 :(x+4)/2 =16 /5;( x+4)/2 = 1/5 :16/5 ; x+4 = 1/16  * 2 ; x =1/8 -4 ; x= -3 7/8