Question

Va rooog e urgent dau coroana ​

Answer 1

Răspuns:  1/20

Explicație pas cu pas:

2 4/5= (5*2+4)/5=14/5

2 14/20=(20*2+14)/20=54/20

1 3/25=(25*1+3)/25=28/25

inlocuiesc in  ex si rezulta

14/5 *(54/20*20/63-28/30:28/25)=

14/5*(54/63-28/30*25/28)=

14/5*(6/7-25/30)=

14/5*(6/7-5/6)=

14/5*(6*6/42-5*7/42)=

14/5*(36/42-35/42)=14/5*1/42=14/42*5=1/4*5=1/20