bonjour
(1/2)³ x 9 - 7 x 3² = (1/8) x 9 - 7 x 9 [ (1/2)³ = 1³ / 2³ = 1 / 8 ]
= 9/8 - 63
= 9/8 - (63 x 8)/ 8
= 9/8 - 504/8
= (9 - 504)/8
= - 495/8
