Odpowiedzi

2009-12-05T17:51:40+01:00
A) (1⅗)² - (1⅗)² * x = (4³ / 5³)¹ * x
(8/5)² - (8/5)²x = (4³/5³)¹*x
64/5 - (64/5)*x = (4³/125)*x /*125
64*5 -64*5*x = 4³*x
- 320x -256x = -320
-576x = -320
x = (-320):(-576)
x = 5/9

b) [(3½)² / 7²]² * x = [(½)⁰ - 5 * (0,3)² * (0,5)⁻¹]²
[ (7/2) /49]²*x = [ 1 -5 *(3/10)² *(1/2)⁻¹]²
[(49/4)/49]²*x = [ 1 - 5*(9/100)*2]²
(¼)²*x = [ 1- (9/10)]²
(1/16)x = (1/10)²
x = (1/100)*16
x = 16/100 = 4/25
x = 4/25