Bonsoir Si vous pouvez m'aider mrc beaucoup

Bonsoir

A = 4 / 5 + 2 / 3
= (4 x 3) / (5 x 3) + (2 x 5) / (3 x 5)
= 12 / 15 + 10 / 15
= (12 + 10) / 15
= 22 / 15

B = 1 / 5 - 6 / 3
= (1 x 3) / (5 x 3) - (6 x 5) / (3 x 5)
= 3 / 15 - 30 / 15
= (3 - 30) / 15
= -27 / 15
= (-27 / 3) / (15 / 3)
= -9 / 5

C = 4 / (-2) - 9 / 4
= (4 x 2) / (-2 x 2) - 9 / 4
= 8 / (-4) - 9 / 4
= (-8) / 4 - 9 / 4
= (-8 - 9) / 4
= -17 / 4

D = 7 / 2 + (-9) / 3
= (7 x 3) / (2 x 3) + (-9 x 2) / (3 x 2)
= 21 / 6 + (-18) / 6
= (21 - 18) / 6
= 3 / 6
= (3 / 3) / (6 / 3)
= 1 / 2

F = 1 - 4 / 5
= 5 / 5 - 4 / 5
= (5 - 4) / 5
= 1 / 5

G = (-2) / 35 + (-5) / (-2)
= -2 / 35 + 5 / 2
= (-2 x 2) / (35 x 2) + (5 x 35) / (2 x 35)
= -4 / 70 + 175 / 70
= (-4 + 175) / 70
= 171 / 70

Voilà j'espère avoir pu t'aider ^^

A=4\5+2\3
=12+10\15
=22\15

B=1\5-6\3
=3-30/15
=-27\15
=-9\5