A, 4/3 -(1/2-1) :3/4 B, 121212/151515 - 262626/656565 - 33333/44444 C, ( 4/19+ 5/78- 31/62 ) - ( 5/78 - -31/62 -87/91 ) D , | -7/3 | -2/3 : ( 25% - 0,3 )