Bonjour,
-7/4 + 5/6 = (-7×3)/(4×3) + (5×2)/(6×2) = -21/12 + 10/12 = -11/12
17/24 - 5/36 = (17×3)/(24×3) - (5×2)/(36×2) = 51/72 - 10/72 = 41/72
3/2 × 9/2 = (3×9)/(2×2) = 27/4
-18/49 × 14/27 = (-18×14)/(49×27) = (-2×9×2×7)/(7×7×3×9) = (-2×2)/(7×3) = -4/21
7/8 ÷ 5/3 = 7/8 × 3/5 = (7×3)/(8×5) = 21/40
3/16 ÷ (-1/12) = 3/16 × (-12) = (-3×3×4)/(4×4) = (-3×3)/(4) = -9/4
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ATTENTION : lorsque l'on multiplie le dénominateur par un nombre, il faut multiplier le numérateur par le même nombre.
Donc :
A = (-7*3)/4*3 + 5*2/6*2
A= -21/12 + 10/12
A= (-21+10)/12
A= -11/12
* représente le signe multiplier
/ représente la barre de fraction
Bonjour,
-7/4 + 5/6 = (-7×3)/(4×3) + (5×2)/(6×2) = -21/12 + 10/12 = -11/12
17/24 - 5/36 = (17×3)/(24×3) - (5×2)/(36×2) = 51/72 - 10/72 = 41/72
3/2 × 9/2 = (3×9)/(2×2) = 27/4
-18/49 × 14/27 = (-18×14)/(49×27) = (-2×9×2×7)/(7×7×3×9) = (-2×2)/(7×3) = -4/21
7/8 ÷ 5/3 = 7/8 × 3/5 = (7×3)/(8×5) = 21/40
3/16 ÷ (-1/12) = 3/16 × (-12) = (-3×3×4)/(4×4) = (-3×3)/(4) = -9/4