3/50-2/125+1/75=
Aducem la acelas numitor,amplifical prima f cu 15 ,a doua 6 si a treia 10
45/750-12/750+10/750=
(45-12+10)/750=
43/750 =(0,05734)
11/700-1/200+3/140=22/1 400-7/1400+300/1400=(22-7+300)/1400=
315/1400=1/4
7/36-1/4+4/72+5/12=
14-72+18/72+4/72+39/72=
-4+43/72=39/72