Coucou :)
Ex.1
[tex]A= \frac{7}{9} + \frac{2}{3} \\ = \frac{7*2}{9*2} + \frac{2*6}{3*6} \\ = \frac{14}{18} + \frac{12}{18} \\ = \frac{26}{18} \\ = \frac{13}{9}[/tex]
[tex]B= \frac{1}{3} + \frac{3}{4} \\= \frac{1*4}{3*4} + \frac{3*4}{4*3} \\= \frac{4}{12} + \frac{12}{12} \\= \frac{16}{12}[/tex]
[tex]C= \frac{20}{13} + \frac{1}{2} \\\\= \frac{20*2}{13*2} + \frac{1*13}{2*13} \\= \frac{40}{26} + \frac{13}{26} \\\\= \frac{53}{26}[/tex]
Ex.2
D= 7 +3 + (-6)
= 10 + -6
= 4
E= -6 + (-3) - (+1)
= -9 - (+1)
= -9 + (-1)
= -10
F= -5 - (+2) + 3
= -5 + -2 + 3
= -7 +3
= -4
G = 7 + 1 +2 - (+4)
= 10 - (+4)
= 10+ (-4)
= 6
Rappel:
" * " signifie le signe multiplier " × "
Bonne journée à toi et bonnes vacances ^^
