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2,5*(8/15 :4 +0,15)-5/24=
=5/2*(8/15 * 1/4 + 3/20)-5/24=5/2*(40/300 + 45/300)-5/24=
=5/2* 85/300 - 5/24=425/600 - 125/600= 300/600=1/2
a)
2i 1/2*(0,15+ 8/12:4)-5/14=
5/2(3/20+ 2/12)-5/14=5/2(9/60 + 10/60) -5/14=
=19/24 -5/14=266/350 - 120/350=146/350=73/175