Răspuns:
Exercituil 9.
a= 2
b= -14
[tex]\frac{a-3*b}{3a+b} = \frac{2-3*(-14)}{3*2-14} = \frac{44}{8} = \frac{11}{2}[/tex]
Exercitiul 10
x+y=67 ⇒y =67-x
[tex]\frac{x-10}{y} = \frac{1}{2}[/tex] ⇒ 2(x-10) = y ⇒ 2x -20 = 67 - x ⇒ 3x = 87 ⇒ x = [tex]\frac{87}{3}[/tex]= 29
y = 67 - x ⇒ y = 67 - 29 = 38
Exercitiul 11
A={64,102,1234,5532,10010, [tex]10^{5}[/tex]}
B={27,102,5532}
C={5532}
