решите пример (20-19 3/4)+(17 3/4-17)+(2 1/2-17/24)

(20-19\frac{3}{4} )+(17\frac{3}{4} -17)+(2\frac{1}{2} -\frac{17}{24} )=\frac{1}{4} +\frac{3}{4} +(2\frac{12}{24} -\frac{17}{24} )=1+(1\frac{36}{24} -\frac{17}{24} )=1+1\frac{19}{24} =2\frac{19}{24}