Aidez moi svp en math niveau 4 ème fraction . Merci a ceux qui m'aideront

Bonjour,

8/5 * 7/9 = (8 * 7)/(5 * 9) = 56/45

7/3 * 5 = (7 * 5)/3 = 35/3

7/3 + 4/3 = (7 + 4)/3 = 11/3

7/6 * 5/9 = 35/54

6/7 + 9/7 = (6 + 9)/7 = 15/7

6/7 * 9/7 = (6 * 9)/(7 * 7) = .....

Réponse :

Explications étape par étape

À=16+7*(12-4)

A=16+7*8

A=16+64

A=80

B=2*(4+3*5)+7*(17-8)

B=2*(4+15)+7*9

B=2*19+72

B=38+72

B=110

C=3+2*[5+3*(1+2*4)]

C=3+2*[5+3(1+8)]

C=3+2*[5+3*9]

C=3+2*[5+27]

C=3+2*32

C=3+64

C=67

D=2*[6+2*(6+3*8)]-4*(12-3)

D=2*[6+2*(6+24)]-4*9

D=2*[6+2*30]-4*9

D=2*[6+60]-4*9

D=2*66-4*9

D=132-36

D=96

E=5+6*[3*(2²+7)-4*(9-2)]

E=5+6*[3*(4+7)-4*7]

E=5+6*[3*11-4*7]

E=5+6*[33-28]

E=5+6*5

E=5+30

E=35

F=7+2*{2*[5+2*(7+2*3)]-9*[3*(6*4-16)-21]}

F=7+2*{2*[5+2*(7+6)]-9*[3*(24-16)-21]}

F=7+2*{2*[5+2*13]-9*[3*8-21]}

F=7+2*{2*[5+26]-9*[24-21]}

F=7+2*{2*31-9*3}

F=7+2*{62-27}

F=7+2*35

F=7+70

F=77

A=8/5*7/9=64/45

B=7/3*15/3=105/9=35/3

C=7/3+4/3=11/3

D=7/6*5/9=35/54

E=6/7+9/7=15/7

F=6/7*9/7=54/49