Calculer A A=6/5 -17/14 : 5/7 .... Resoudre 8x-5<2x-5

8x-2x < -5+5
6x < 0
X < 0/6

voila
celui d'en au je sais pas

Bonsoir,

Calculer A
A=6/5 -17/14 : 5/7

[tex]A=\dfrac{6}{5} -\dfrac{17}{14} : \dfrac{5}{7}\\\\A=\dfrac{6}{5} -\dfrac{17}{14} \times \dfrac{7}{5}\\\\A=\dfrac{6}{5} -\dfrac{17}{2} \times \dfrac{1}{5}\\\\A=\dfrac{6}{5} -\dfrac{17}{10}\\\\A=\dfrac{12}{10} -\dfrac{17}{10}\\\\A=-\dfrac{5}{10}[/tex]

[tex]\\\\\boxed{A=-\dfrac{1}{2}}[/tex]

Resoudre 
8x-5<2x-5

[tex]8x-5<2x-5\\8x-2x<-5+5\\6x<0\\\\x<\dfrac{0}{6}\\\\\boxed{x<0}\\\\\boxed{S=]-\infty\ ;\ 0[\ }[/tex]