Odpowiedź:
zad 5
a)
(1/4 - 1/3 - 1/6)/(1/8 - 1/5 - 1/10) = (3/12 - 4/12 - 2/12)/(5/40 - 8/40 - 4/40) =
= (- 3/12)/( - 7/40) = - 3/12 : ( - 7/40) = - 3/12 * (- 40/7) = 3/12 * 40/7 =
= 3/3 * 10/7 = 1 * 10/7 = 10/7 = 1 3/7
b)
(9/5 : 3/7 - 3 3/4 * 2/5)/( 5 1/4 * 3/7) = ( 9/5 * 7/3 - 15/4 * 2/5)/(21/4 * 3/7) =
= (3/5 * 7 - 3/2 * 1)/(3/4 * 3) = ( 21/5 - 3/2)/(9/4) = (42/10 - 15/10)/(9/4) =
= 27/10 : 9/4 = 27/10 * 4/9 = 3/5 * 2 = 6/5 = 1 1/5 = 1,2
