Répondre :
Bonsoir,
a. -5/12 × 72/21 - ¾ (2 + 2/21)
= -360/252 - ¾ (42/21+2/21)
= 10/7 - ¾×44/21
= 10/7 - 132/84
= -10/7 - 11/7
= -21/7 = -3
b. (5/2 - 1/4) x 5/6 - (3-7/6)
= (10/4-1/4)×5/6 - (18/6-7/6)
= 9/4×5/6 -11/6
= 45/24 - 44/24
= 1/24
a. -5/12 × 72/21 - ¾ (2 + 2/21)
= -360/252 - ¾ (42/21+2/21)
= 10/7 - ¾×44/21
= 10/7 - 132/84
= -10/7 - 11/7
= -21/7 = -3
b. (5/2 - 1/4) x 5/6 - (3-7/6)
= (10/4-1/4)×5/6 - (18/6-7/6)
= 9/4×5/6 -11/6
= 45/24 - 44/24
= 1/24
bonjour voilà la réponse
-5/12 x 72/21 - 3/4 (2 + 2/21)
= (-5*72)/(12*21) - 3/4 (2/1 + 2/21)
= (-5*12*6)/(12*21) - 3/4 [(2*21)/(1*21) + 2/21]
= -30/21 - 3/4 (42/21 + 2/21)
= -30/21 - 3/4 * 44/21
= -30/21 - (3*44)/(4*21)
= -30/21 - (3*4*11)/(4*21)
= -30/21 - 33/21
= (-30-33)/21
= -63/21
= -3
(5/2 - 1/4) x 5/6 - (3-7/6)
= [(5*2)/(2*2) - 1/4] * 5/6 - [(3*6)/(1*6) - 7/6]
= (10/4 - 1/4) * 5/6 - (18/6 - 7/6)
= (10-1)/4 * 5/6 - (18-7)/6
= 9/4 * 5/6 - 11/6
= (9*5)/(4*6) - 11/6
= (3*3*5)/(4*3*2) - 11/6
= 15/8 - 11/6
= (15*6)/(8*6) - (11*8)/(6*8)
= 90/48 - 88/48
= (90-88)/48
= 2/48
= 1/ 24
voilà ^^
-5/12 x 72/21 - 3/4 (2 + 2/21)
= (-5*72)/(12*21) - 3/4 (2/1 + 2/21)
= (-5*12*6)/(12*21) - 3/4 [(2*21)/(1*21) + 2/21]
= -30/21 - 3/4 (42/21 + 2/21)
= -30/21 - 3/4 * 44/21
= -30/21 - (3*44)/(4*21)
= -30/21 - (3*4*11)/(4*21)
= -30/21 - 33/21
= (-30-33)/21
= -63/21
= -3
(5/2 - 1/4) x 5/6 - (3-7/6)
= [(5*2)/(2*2) - 1/4] * 5/6 - [(3*6)/(1*6) - 7/6]
= (10/4 - 1/4) * 5/6 - (18/6 - 7/6)
= (10-1)/4 * 5/6 - (18-7)/6
= 9/4 * 5/6 - 11/6
= (9*5)/(4*6) - 11/6
= (3*3*5)/(4*3*2) - 11/6
= 15/8 - 11/6
= (15*6)/(8*6) - (11*8)/(6*8)
= 90/48 - 88/48
= (90-88)/48
= 2/48
= 1/ 24
voilà ^^
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