Odpowiedź :
Odpowiedź:
[tex]2x-\frac{1}{2}=3\\\\4x-1=6\\\\4x=7\\\\x=\frac{7}{4}\\\\\\2\cdot\frac{7}{4}-\frac{1}{2}=3\\\\\frac{14}{4}-\frac{1}{2}=3\\\\\frac{14}{4}-\frac{2}{4}=3\\\\\frac{12}{4}=3\\\\3=3[/tex]
[tex]\frac{1}{5}x+4=3,1\\\\x+20=15,5\\\\x=-4,5\\\\\\\frac{1}{5}\cdot(-4,5)+4=3,1\\\\0,2\cdot(-4,5)+4=3,1\\\\-0,9+4=3,1\\\\3,1=3,1[/tex]
Szczegółowe wyjaśnienie:
2x - ½ = 3
2x = 3¹/₂
x = ⁷/₄
2 · ⁷/₄ - ¹/₂ = ¹⁴/₄ - ²/₄ = 3
⅕x + 4 = 3,1
⅕x = -⁹/₁₀
x = -⁴⁵/₁₀
⅕ · (-⁴⁵/₁₀) + 4 = - ⁴⁵/₅₀ + 4 = 3,1