Répondre :
[tex]A = \frac{4}{9}\times \frac{9}{4}- \frac{36}{4}+9\\\\
A = 1 - \frac{36}{4} +\frac{36}{4}\\\\
A = 1 [/tex]
A[tex]= \frac{4}{9} \times \frac{9}{4} - \frac{36}{4}+9 \\ \\ = \frac{36}{36}- \frac{36}{4} +9 \\ \\ =1+9- \frac{36}{4} \\ \\ =1+ \frac{36}{4} - \frac{36}{4} \\ \\ \boxed{=1}
[/tex]