Question

Exercițiile 9 și 10

Answer 1

Rezolvarile complete in atasament...

Answer 2

9. a. (1/2 ·2/3 ·3/4 ·......·2013/2014)+2013/2014 =
1/2014+2013/2014=2014/2014=1 ;
b. (7/4+7/8+7/12+......+7/100)/(1/4+1/8+1/12+......+1/100) =
7(1/4+1/8+1/12+......+1/100)/(1/4+1/8+1/12+......+1/100) =7 ;
10. x=numarul total de locuri ;
2/3 ·x +20=3/4 ·x ⇔
2x+60 /3=3x/4 ⇔4(2x+60) /12=9x/12 ⇔4(2x+60)=9x ⇔
x=240 (locuri-are avionul);