Вычисли. 13/25+2/25+3/25. 19/34-6/34+3/34. 7/90+55/90+5/90. 23/40+5/40+1/40. помогите...

Решите задачу:

$\frac{13}{25}+\frac{2}{25}+\frac{3}{25}=\frac{13+2+3}{25}=\frac{18}{25}\\ \\ \\ \frac{19}{34}-\frac{6}{34}+\frac{3}{34}=\frac{19-6+3}{34}=\frac{16}{34}=\frac{8}{17} \\ \\ \\ \frac{7}{90}+\frac{55}{90}+\frac{5}{90}=\frac{7+55+5}{90}=\frac{67}{90} \\ \\ \\ \frac{23}{40}+\frac{5}{40}+\frac{1}{40}=\frac{23+5+1}{40}=\frac{29}{40}$