Question

Va rog repede dau coroana. Ex 6 ​

Answer 1

Răspuns:

Explicație pas cu pas:

a) 3^101/(3^101+3^102)= 3^101/3^101·(1+3)=3^101/(3^101·4)=1/4

b) (7^10+2·7^11+3·7^12)/(12·7^10)=7^10·(1+2·7+3·49)/(12·7^10)= (1+14+147)/12= 162/12=81/6=27/2

c) (2+4+6+....+160)/(3+6+9+....+240)=2·(1+2+3+...+80)/3·(1+2+3+...+80)=2/3

d) (5+10+15+...+100)/(4+8+12+...+80)= 5·(1+2+3+...+200)/4·(1+2+3+...+20)= 5/4