Sagot :
C=(2+(2/5))((1/4)-(2/3))=(2/4)-(4/3)+(2/20)-(4/15)=(1/2)-(4/3)+(1/10)-(4/15)=(15/30)-(40/30)+(3/30)-(8/30)=-35/30
D=(15/32)*(4/3)*(16/25)=(15*4*16)/(32*3*25)=(3*5*4*2*8)/(4*8*3*5*5)=2/5
D=(15/32)*(4/3)*(16/25)=(15*4*16)/(32*3*25)=(3*5*4*2*8)/(4*8*3*5*5)=2/5
Bonsoir
C = (2+2/5)(1/4-2/3) = (10/5+2/5)(3/12-8/12) = 12/5 x -5/12 = -60/60 = -1
D = 18/32 x 4/3 x 16/25 : tu commences par simplifier et tu obtiens : 5/8 x 1/1 x 16/25 = 80/200 =2/5
x+y = 5
x+4y = 6
-4x -4y = -20
x+4y = 6
-3x = -14 et x = 14/3
14/3 + 4y = 6
14+12y = 18
12y = 18-14
12y = 4 et y = 4/12 = 1/3 y = 1/3
Vérification
x +y = 5
14/3 + 1/3 = 5
14/3 + 1/3 = 15/3
15/3 = 15/3
C = (2+2/5)(1/4-2/3) = (10/5+2/5)(3/12-8/12) = 12/5 x -5/12 = -60/60 = -1
D = 18/32 x 4/3 x 16/25 : tu commences par simplifier et tu obtiens : 5/8 x 1/1 x 16/25 = 80/200 =2/5
x+y = 5
x+4y = 6
-4x -4y = -20
x+4y = 6
-3x = -14 et x = 14/3
14/3 + 4y = 6
14+12y = 18
12y = 18-14
12y = 4 et y = 4/12 = 1/3 y = 1/3
Vérification
x +y = 5
14/3 + 1/3 = 5
14/3 + 1/3 = 15/3
15/3 = 15/3