Question

1) Se considera nr rationale :
x=2 (supra/pe) 7 si y=5 (supra/pe)7
Calculati:
a) modulul lui x
b) x+y=
c)x-y=
d)x(la patrat /la puterea a 2-a)

Answer 1

a) |x| = |2/7|
b) x + y = 2/7 + 5/7
x+y = (2 + 5)/7
x + y =7 / 7;
x + y = 1;
c) x - y = 2/7 -5/7
=> x - y =(2 - 5)/7;
x - y = -3/7;
d) x² = 2²/7²
x² = 4/49;