Question

Rezolvati in multimea numerelor rationale ecuatia 2*[(2-1,5)^2-0,(3)]=0,5X

Answer 1

0,5 = 5/10 = 1/2
0,(3) = 3/9 = 1/3

Answer 2

2 · [ ( 2 - 1,5 )² - 0, ( 3 ) ] = 0, 5 x

5 x / 10 = 2 · [ ( 2 - 15 / 10 )² - 3 / 9 ]

x / 2 = 2 · [ ( 2 - 3 / 2 )² - 1 / 3 ]

x / 2 = 2 · [ ( 4 / 2 - 3 / 2 )² - 1 / 3 ]

x = 4 · ( 1 / 4 - 1 / 3 )

x = 4 · ( 3 / 12 - 4 / 12 )

x = - 1 / 3