exercice 1
A=7/3-3/7=(49-9)/21=40/21
B=10/33-3/22=(220-99)/726=121/726
C=(22/49)*(25/33)*(28/15)=(22*25*28)/(49*33*15)=(2*11*5*5*4*7)/(7*7*3*11*3*5)=(2*5*4)/(7*3*3)=40/73 (les chiffres en gras s'annule vu que c'est des multiplication)
E=5/7+(8/7:6/5)=5/7+(8*5)/(7*6)=5/7+40/42=(30+40)/42=70/42=35/21
F=(13/15)/(21/54)=(13*54)/(15*21)=702/315=78/35 (même principe)
exercice 2
G=(12x-6x²-20+10x)-(3x²+15x-x-5)=22x-6x²-20-3x²-14x+5=-9x²+8x-15
x=4
-9*4²+8*4-15=7+32-15=24
G(4)=24
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exercice 1
A=7/3-3/7=(49-9)/21=40/21
B=10/33-3/22=(220-99)/726=121/726
C=(22/49)*(25/33)*(28/15)=(22*25*28)/(49*33*15)=(2*11*5*5*4*7)/(7*7*3*11*3*5)=(2*5*4)/(7*3*3)=40/73 (les chiffres en gras s'annule vu que c'est des multiplication)
E=5/7+(8/7:6/5)=5/7+(8*5)/(7*6)=5/7+40/42=(30+40)/42=70/42=35/21
F=(13/15)/(21/54)=(13*54)/(15*21)=702/315=78/35 (même principe)
exercice 2
G=(12x-6x²-20+10x)-(3x²+15x-x-5)=22x-6x²-20-3x²-14x+5=-9x²+8x-15
x=4
-9*4²+8*4-15=7+32-15=24
G(4)=24
A = 7/3 - 3/7
A = 49/21 - 9/21
A = 40/49
B = 10/33 - 3/22
B = 20/66 - 9/66
B = 11/66
B = 1/6
C = 22/49 x 25/33 x 28/15
C = 11 x 2 x 5 x 5 x 7 x 4 / 7 x 7 x 3 x 11 x 3 x 5
C = 40/63
E = 5/7 + 8/7 : 6/5
E = 5/7 + 8/7 x 5/6
E = 5/7 + 2 x 4 x 5 / 7 x 3 x 2
E = 5/7 + 20/21
E = 15/21 + 20/21
E = 35/21
E = 5/3
F = (5 - 2/3) : (1/6 + 2/9)
F = (15/3 - 2/3) : (3/18 + 4/18)
F = 13/3 : 7/18
F = 13/3 x 18/7
F = 78/7
J'espère t'avoir aidé(e) ! :)