Question

11.Calculati
a)√48·27
b)√50·72
c)√98·18
d)√75·243
e)√13²-12²
f)√17²-8²
g)√25²-24²
h)√117²-108²
Repede va rooooog trebuie urgent :(
dau 50 de puncte

Answer 1

a) rad(48.27)=rad(9 x 48 x 3) = rad(9 x 144) = rad9 x rad144=3 x 12 = 36
b) 50 x 72 = 2 x 5 x5 x 2 x 36 = 4 x 25 x 36
rad(4 x 25 x 36) = 2 x 5 x 6 = 60
c) p= 98 x 18 = 2 x 49 x 2 x 9 si rad(p)= 2 x 7 x 3 = 42
d) p = 3 x 25 x 3 x 81 si atunci avem rad(p)= 3 x 5 x 9 = 135
e) d= (13-12)(13+12) = 1 x 25 si atunci rad(d) = 1 x 5 = 5
f) d = (17-8)(17+8) = 9 x 25 = 3 x 5 = 15 cu formula algebrica a^2-b^2 = (a-b)(a+b)
g) d = (25-24)(25+24) = 1 x 49 rad(d) = 1 x 7 = 7
h) d= (117-108)(117+108) = 9 x 225 si atunci rad(d) = 3 x 15 = 45

Succes! Si astept coroana! :)