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b) (2 5/10-1 5/10× 1 1/3)× 2 2/3=(25/10 - 15/10×4/3)×8/3=(10/10 ×4/3)×8/3=20/15×8/3=160/45=32/9=3 5/9
(1,2 : 3/5 - 1 1/3 * 0,3) :(-1 i 1/7 ) = (6/5 * 5/3 - 4/3 * 3/10) : (- 8/7) =
= (2 - 2/5) * (- 7/8) = 1 3/5 * (- 7/8) = 8/5 * (-7/8) = - 7/5 = - 1 2/5
b)
(2,5 -1,5 * 1 i 1/3 ) * 2 i 2/3 = (1 * 1 1/3) * 8/3 = 4/3 * 8/3 = 32/9 = 3 5/9