Question

Efectuați repede va rog dau coroana​

Answer 1

Răspuns:

Explicație pas cu pas:

a) 14/5*(27/10*20/63-14/15*25/28)

14/5*(54/63-5/6)

14/5*(108/126-105/126)

14/5*3/126=3/45=1/15

b) [(7/15+5/15-3/15)*5/4+(2/4-1/4)*12/5]*2/7

(3/5*5/4+1/4*12/5)*2/7

(3/4+3/5)*2/7

(15/20+12/20)*2/7

27/20*2/7=27/70