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50/7*7/100-45/8*16/10 =
1/2-9=-8 1/2
b) -2,34*3 11/13+1,25*5 5/9 =
-234/100*50/13+125/100*50/9=
-9/1+125/18 =
-162/18+125/18=
-37/18 = -2 1/18