53 7/9 * 3 15/22 - 8,2 * (-25/82) + 4 17/38 * (-4 5/13)
Заранее спасибо

53 7/9 * 3 15/22 - 8,2 * (-25/82) + 4 17/38 * (-4 5/13)= - 19 4/9. 1)) 53 7/9• 3 15/22= (53•9+7)/9• (3•22+15)/22=484/9• 81/22= сокращаем 9 и 81 на 9; 484 и 22 на 22. 22/1• 9/1= 22/9= 2 4/9. 2)) 8,2• (-25/82)= 82/10• (-25/82)=Сокращаем 82 и 82 на 82; 10 и 25 на 5; 1/2• (-5/1)= (-5/2 )= (-2 1/2) 3)) 4 17/38• (-4 5/13)=(4•38+17)/38• (- 4•13+5)/13=169/38• (-57/13)= Сокращаем169 и 13 на 13; 38 и 57 на 19. 13/2• (-3/1)= (-39/2) = (-19 1/2) 4)) 2 4/9- (-2 1/2)+ (- 19 1/2) =2 4/9+ 2 1/2- 19 1/2= -( 2 4/9- 2 1/2 + 19 1/2)= -(2 4/9 + 17)= -19 4/9.