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Sagot :
Bonsoir
25/12 - 7/6 + 5/9
= (25 x 3)/(12 x 3) - (7 x 6)/(6 x 6) + (5 x 4)/(9 x 4)
= 75/36 - 42/36 + 20/36
= (75 - 42 + 20)/36
= 53/36
-6/5 x 3/2 x 10/9
= (-6 x 3 x 10) / (5 x 2 x 9)
= (-1 x 3 x 2 x 3 x 5 x 2) / (5 x 2 x 3 x 3)
= -1 x 2
= -2
5 - 7/3
= (5 x 3)/(1 x 3) - 7/3
= 15/3 - 7/3
= (15-7)/3
= 8/3
-1/2 - 1/3
= (-1 x 3)/(2 x 3) - (1 x 2)/(3 x 2)
= -3/6 - 2/6
= (-3 - 2)/6
= -5/6
-2/3 - 4/5 + 8/15
= (-2 x 5)/(2 x 5) - (4 x 3)/(5 x 3) + 8/15
= -10/15 - 12/15 + 8/15
= (-10 - 12 + 8)/15
= -14/15
24/35 x 21/40 x 5/2
= (24 x 21 x 5) / (35 x 40 x 2)
= (4 x 3 x 2 x 7 x 3 x 5) / (7 x 5 x 4 x 10 x 2)
= (3 x 3)/10
= 9/10
Voilà j'espère avoir pu t'aider ^^
25/12 - 7/6 + 5/9
= (25 x 3)/(12 x 3) - (7 x 6)/(6 x 6) + (5 x 4)/(9 x 4)
= 75/36 - 42/36 + 20/36
= (75 - 42 + 20)/36
= 53/36
-6/5 x 3/2 x 10/9
= (-6 x 3 x 10) / (5 x 2 x 9)
= (-1 x 3 x 2 x 3 x 5 x 2) / (5 x 2 x 3 x 3)
= -1 x 2
= -2
5 - 7/3
= (5 x 3)/(1 x 3) - 7/3
= 15/3 - 7/3
= (15-7)/3
= 8/3
-1/2 - 1/3
= (-1 x 3)/(2 x 3) - (1 x 2)/(3 x 2)
= -3/6 - 2/6
= (-3 - 2)/6
= -5/6
-2/3 - 4/5 + 8/15
= (-2 x 5)/(2 x 5) - (4 x 3)/(5 x 3) + 8/15
= -10/15 - 12/15 + 8/15
= (-10 - 12 + 8)/15
= -14/15
24/35 x 21/40 x 5/2
= (24 x 21 x 5) / (35 x 40 x 2)
= (4 x 3 x 2 x 7 x 3 x 5) / (7 x 5 x 4 x 10 x 2)
= (3 x 3)/10
= 9/10
Voilà j'espère avoir pu t'aider ^^
Bonsoir,
25/12 - 7/6 + 5/9 =
25/12 - 14/12 + 5/9 =
11/12 + 5/9 =
33/36 + 20/36 = 53/36
-6/5 x 3/2 x 10/9 =
(-6 x 3 x 10) / (5 x 2 x 9) =
(-2 x 9 x 10) / (10 x 9) = (-2)
5 - 7/3 = 15/3 - 7/3 = 8/3
-1/2 - 1/3 = -3/6 - 2/6 = (-5/6)
-2/3 - 4/5 + 8/15 =
-10/15 - 12/15 + 8/15 =
-22/15 + 8/15 = (-14/15)
24/35 x 21/40 x 5/2 =
(24 x 21 x 5) / (35 x 40 x 2) =
(3 x 8 x 3 x 7 x 5) / (7 x 5 x 8 x 5 x 2) =
9 / 10
25/12 - 7/6 + 5/9 =
25/12 - 14/12 + 5/9 =
11/12 + 5/9 =
33/36 + 20/36 = 53/36
-6/5 x 3/2 x 10/9 =
(-6 x 3 x 10) / (5 x 2 x 9) =
(-2 x 9 x 10) / (10 x 9) = (-2)
5 - 7/3 = 15/3 - 7/3 = 8/3
-1/2 - 1/3 = -3/6 - 2/6 = (-5/6)
-2/3 - 4/5 + 8/15 =
-10/15 - 12/15 + 8/15 =
-22/15 + 8/15 = (-14/15)
24/35 x 21/40 x 5/2 =
(24 x 21 x 5) / (35 x 40 x 2) =
(3 x 8 x 3 x 7 x 5) / (7 x 5 x 8 x 5 x 2) =
9 / 10
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