Svp aider moi c'est pour aujourd'hui

1/3 + 4/9 = 1x3/3x3 + 4/9 = 3/9 + 4/9 = 7/9

1/2 - 1/8 = 1x4/2x4 - 1/8 = 4/8 - 1/8 = 3/8

7/9 x 3/8 = 7x3 / 9x8 = 21/72 = 3x7/3x24 = 7/24

b. (1/3 + 4/9) x (1/2 - 1/8) =