Пошаговое объяснение:
(3 5/16+3/4у)÷6 1/4=13/20
(3 5/16+3/4у)=6 1/4*13/20
(3 5/16+3/4у)=25/4*13/20
(3 5/16+3/4у)=65/16
3/4у=65/16-3 5/16
3/4у=65/16-53/16
3/4у=12/16
У=12/16*4/3
У=4/4=1
Пошаговое объяснение:
(3 5/16+3/4у)÷6 1/4=13/20
(3 5/16+3/4у)=6 1/4*13/20
(3 5/16+3/4у)=25/4*13/20
(3 5/16+3/4у)=65/16
3/4у=65/16-3 5/16
3/4у=65/16-53/16
3/4у=12/16
У=12/16*4/3
У=4/4=1