Чететырёх этажные дроби, такоеее дерьмо, помогите кому не сложно
830.
и
831.

(a/b)/(c/d)=(a*d)/(b*c)830 (1)((5/8)*(2/3))/(5/9)= ((5/4)*(1/3)/(5/9)= (5/12)/(5/9)=(5*9)/(12*5)= 3/4830(2)((3/4)*(1/3))/(1/2)=  (1/4)/(1/2)=(1*2)/(4*1)= 1/2830(3)((7/15)*(3 3/4))/(2 5/8)= ((7/15)*(15/4)/(21/8)= (7/4)/(21/8)=(7*8)/(4*21)= 2/3830(4)((5/12)*(4/5))/(2/9)=  (1/3)/(2/9)=(1*9)/(3*2)= 3/2831(1)3/(1-(1/2))= 3/(1/2)=(3*2)/(1*1)=6831(2)(1-(1/4))/(1 1/2)=(3/4)/(3/2)=(3*2)/(4*3)=1/2831(3)((2/3)+(1/4))/(1 5/6)= (11/12)/(11/6)=(11*6)/(12*11)=1/2831(4)(8 1/3)/((8/9)-(1/3))=(25/3)/(5/9)=(25*9)/(3*5)=15