svp aider moi important A= 12/5-3/5×7/9 et B=(2/3-3):1/9 Merci d'avance

Bonjour Christpvp1

[tex]A= \dfrac{12}{5}-\dfrac{3}{5}\times\dfrac{7}{9}\\\\A= \dfrac{12}{5}-\dfrac{3\times7}{5\times9}\\\\A= \dfrac{12}{5}-\dfrac{21}{45}\\\\A= \dfrac{12}{5}-\dfrac{7}{15}\\\\A= \dfrac{12\times3}{5\times3}-\dfrac{7}{15}\\\\A= \dfrac{36}{15}-\dfrac{7}{15}[/tex]

[tex] \\\\\boxed{A= \dfrac{29}{15}}[/tex]


[tex]B=(\dfrac{2}{3}-3):\dfrac{1}{9}\\\\B=(\dfrac{2}{3}-\dfrac{9}{3}):\dfrac{1}{9}\\\\B=(-\dfrac{7}{3}):\dfrac{1}{9}\\\\B=(-\dfrac{7}{3})\times\dfrac{9}{1}}\\\\B=-\dfrac{63}{3}\\\\\boxed{B=-21}[/tex]