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b)21+(12-125 5/6)=21+(-113 5/6=-92 5/6
c)(5 3/4+0,04)*10/3=(5 3/4+4/100)*10/3=(5 300/400+16/400)*10/3=5 316/400 *10/3=2316/400*10/3=772/40=19 12/40
d)(25:8)+(3 1/6-1,125)=3,125+(3 1/6- 1 1/8)=3,125+(3 8/48-1 6/48)=3,125+2 2/48=3 1/8+2 2/48=3 6/48+2 2/48=5 8/48