Question

daca din dublul unui numar se scade 5 se obtine un numar intre -3 si 3. Aflati numerele care indeplinesc aceste conditii

Dau coroana!!

Answer 1

2x-5=-3

2x=2, x=1

2x-5=-2

2x=-3

2x-5=-1

2x=4, x=2

2x-5=0

2x=5

2x-5=1

2x=6, x=3

2x-5=2

2x=7

2x-5=3

2x=8, x=4

x={1, 2, 3, 4}

nr sunt 1, 2, 3, 4

Answer 2

$\it Fie\ \ x,\ \ un\ astfel\ de \ num\breve ar.\\ \\ 2x-5\in (-3,\ 3)|_{+5} \Rightarrow 2x\in (2,\ \ 8)|_{:2} \Rightarrow x\in (1,\ \ 4)\\ \\ x\in\mathbb{Z} \Rightarrow x\in\{2,\ \ 3\}$