Скоратите дробь: 1) 25+15/15×8 2)9+36/9×25 3) (11+88)×12/11×60 4)19×(29+87)/29×76...

1) $\frac{25+15}{15*8} = \frac{40}{15*8} = \frac{5}{15} = \frac{1}{3}$
2) $\frac{9+36}{9*25} = \frac{45}{9*25} = \frac{5}{25} = \frac{1}{5}$
3) $\frac{(11+88)*12}{11*60} = \frac{99}{11*5} = \frac{9}{5} = 1 \frac{4}{5}$
4) $\frac{19*(29+87)}{29*76} = \frac{19*29*(1+3)}{29*76} = \frac{19*29*4}{29*76}$ = $\frac{19*4}{76} = \frac{1}{1} = 1$
5) $\frac{17*8-12*8}{80} = \frac{8*(17-12)}{80} = \frac{1*5}{10} = \frac{5}{10} = \frac{1}{2}$