Question

Fie a=radical din 2 b= radical din 3 Calculați a+b supra a -b
Repede va rog

Answer 1

a=√2=1,41
b=√3=1,73
$\dfrac{a+b}{a-b}=\dfrac{1,41+1,73}{1,41-1,73}=\dfrac{3,14}{-0,32}=-9,81$

Answer 2

(a+b)/(a-b) = [(a+b)(a+b)][(a-b)(a+b)] = (a+b)²/(a² - b²) =

= (√2 + √3)²/[(√2)² - (√3)²] = (2 +3 +2√2√3)/(2 - 3) = (5+2√6)/(-1) =

= -5 -2√6.