Question

se da a=1+2+3+.........+15si b=1+2+.....+20 calculati a:b+b:7

Answer 1

(1+2+..+15):(1+2+..+20) + (1+2+..20):7 = 
= (15x16:2):(20x21:2) + (20x21:2):7
= 120:210 + 210:7
= 0,57 + 30
= 30,57