bonjour
A = [7 ( x + 3 ) - 5 x ( 3 + x )] / ( 3 + x ) ( x + 3 )
A = [ ( 7 x + 21) - ( 15 x + 5 x² )] / ( 3 + x ) ( x + 3 )
A = ( 7 x + 21 - 15 x - 5 x²) / ( 3 + x ) ( x + 3 )
A = ( - 5 x² - 8 x + 21 ) / ( 3 + x ) ( x + 3 )
B = [ x² + ( 5 x + 6 ) ( 5 + x ) ] / x ( 5 + x )
B = ( x² + 25 x + 30 + 5 x² + 6 x ) / ( x ( 5 + x )
B = ( 6 x² + 31 x + 30 ) / x ( 5 + x )
30 x 10 ¹⁰ x 10 ⁻³ sur 5 x 10 ⁴
= 30 x 10 ⁷ / 5 x 10 ⁴
= 6 x 10 ³
