Explications étape par étape:
A =[ -2/(3×7)] ×(2×7)/5] - 8/5=
(-2/3 × 2/5 ) - 8/5=
-4/15 -8/5 = -4/15 - 24/15 = -28/15
B = 1/4 - 5/24 = 6/24 - 5/24 = 1/24
C = 4/-3 + 14/30 = -40/30+14/30 = -26/30 = -13/15
D = (8/15-21/15) × (-3/18 + 4/18) =
-3/15 × 1/18 = -1/5 × 1/18 = -1/90
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Explications étape par étape:
A =[ -2/(3×7)] ×(2×7)/5] - 8/5=
(-2/3 × 2/5 ) - 8/5=
-4/15 -8/5 = -4/15 - 24/15 = -28/15
B = 1/4 - 5/24 = 6/24 - 5/24 = 1/24
C = 4/-3 + 14/30 = -40/30+14/30 = -26/30 = -13/15
D = (8/15-21/15) × (-3/18 + 4/18) =
-3/15 × 1/18 = -1/5 × 1/18 = -1/90