Répondre :
Bonsoir
A=7/4 - 1/8 = 7×2/4×2 - 1/8 = 14/8 - 1/8 = 14-1/8 = 13/8
B=1/8 + 11/24 = 1×3/8×3 + 11/24 = 3/24 + 11/24 = 3+11/24 = 14/24 = 14÷2/24÷2=7/12
C=1/2 +5/9 = 1×9/2×9 + 5×2/9×2 = 9/18 + 10/18 = 9+10/18 = 19/18
D=13/5 - 11/4 = 13×4/5×4 - 11×5/4×5 = 52/20 - 55/20 = 52-55/20 = -3/20
Voilà ^^
A=7/4 - 1/8 = 7×2/4×2 - 1/8 = 14/8 - 1/8 = 14-1/8 = 13/8
B=1/8 + 11/24 = 1×3/8×3 + 11/24 = 3/24 + 11/24 = 3+11/24 = 14/24 = 14÷2/24÷2=7/12
C=1/2 +5/9 = 1×9/2×9 + 5×2/9×2 = 9/18 + 10/18 = 9+10/18 = 19/18
D=13/5 - 11/4 = 13×4/5×4 - 11×5/4×5 = 52/20 - 55/20 = 52-55/20 = -3/20
Voilà ^^
Bonsoir,
A = 7/4 - 1/8
A = (2 x 7)/(2 x 4) - 1/8
A = 14/8 - 1/8
A = 13/8
B = 1/8 + 11/24
B = (1 x 3)/(8 x 3) + 11/24
B = 3/24 + 11/24
B = 14/24
B = (2 x 7)/(2 x 12)
B = 7/12
C = 1/2 + 5/9
C = (1 x 9)/(2 x 9) + (5 x 2)/(9 x 2)
C = 9/18 + 10/18
C = 19/18
D = 13/5 - 11/4
D = (13 x 4)/(5 x 4) - (11 x 5)/(4 x 5)
D = 52/20 - 55/20
D = (-3/20)
A = 7/4 - 1/8
A = (2 x 7)/(2 x 4) - 1/8
A = 14/8 - 1/8
A = 13/8
B = 1/8 + 11/24
B = (1 x 3)/(8 x 3) + 11/24
B = 3/24 + 11/24
B = 14/24
B = (2 x 7)/(2 x 12)
B = 7/12
C = 1/2 + 5/9
C = (1 x 9)/(2 x 9) + (5 x 2)/(9 x 2)
C = 9/18 + 10/18
C = 19/18
D = 13/5 - 11/4
D = (13 x 4)/(5 x 4) - (11 x 5)/(4 x 5)
D = 52/20 - 55/20
D = (-3/20)
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