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3 1/8*2/4-0,75=3 1/8*2/4-3/4=25/8*2/4-3/4=50/32-3/4=50/32-24/32=26/32=13/16
zad.2
(1 2/3:4,5)*1.8=(5/3:45/10)*1.8=10/27*1.8=
zad.3
(2,4+2 3/5)*3=(2,4+2,6