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Anastasia3
@Anastasia3
April 2019
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Svp c'est URGENT
a. 5/6 + -1 /3= bon je met l' image mais beaucoup disent que l' image est trop petit ils voyant rien mais faut cliquer sur l' image c'est tout et hop plus grand svp aider moi le 23 et le 25 au moins un seul et merci d' avance je donne 20 points
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maudmarine
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A) - 7/50 + 2/25
= - 7/50 + 2 x 2 / 25 x 2
= - 7/50 + 4/50
= - 3/50
b) 1/5 + - 2/3
= 1/5 - 2/3
= 1 x 3 / 5 x 3 - 2 x 5 / 3 x 5
= 3/15 - 10/15
= - 7/15
c) 1/12 - 1/9
= 1 x 3 / 12 x 3 - 1 x 4 / 9 x 4
= 3/36 - 4/36
= - 1/36
d) 4/18 + 5/27
= 4 x 3 / 18 x 3 + 5 x 2 / 27 x 2
= 12/54 + 10/54
= 22/54
= 2 x 11 / 2 x 27
= 11/27
e) 17/- 24 + (- 5/36)
= - 17/24 - 5/36
= - 17 x 3 / 24 x 3 - 5 x 2 / 36 x 2
= - 51/72 - 10/72
= - 61/72
f) 3/16 - - 1/12
= 3/16 + 1/12
= 3 x 3 / 16 x 3 + 1 x 4 / 12 x 4
= 9/48 + 4/48
= 13/48
g) 8/- 17 - (- 1/15)
= - 8/17 + 1/15
= - 8 x 15 / 17 x 15 + 1 x 17 / 15 x 17
= - 120/255 + 17/255
= - 103/255
h) 2/5 + - 2/15 - 7/12
= 2/5 - 2/15 - 7/12
= 2 x 12 / 5 x 12 - 2 x 4 / 15 x 4 - 7 x 5 / 12 x 5
= 24/60 - 8/60 - 35/60
= - 19/60
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Verified answer
A) - 7/50 + 2/25= - 7/50 + 2 x 2 / 25 x 2
= - 7/50 + 4/50
= - 3/50
b) 1/5 + - 2/3
= 1/5 - 2/3
= 1 x 3 / 5 x 3 - 2 x 5 / 3 x 5
= 3/15 - 10/15
= - 7/15
c) 1/12 - 1/9
= 1 x 3 / 12 x 3 - 1 x 4 / 9 x 4
= 3/36 - 4/36
= - 1/36
d) 4/18 + 5/27
= 4 x 3 / 18 x 3 + 5 x 2 / 27 x 2
= 12/54 + 10/54
= 22/54
= 2 x 11 / 2 x 27
= 11/27
e) 17/- 24 + (- 5/36)
= - 17/24 - 5/36
= - 17 x 3 / 24 x 3 - 5 x 2 / 36 x 2
= - 51/72 - 10/72
= - 61/72
f) 3/16 - - 1/12
= 3/16 + 1/12
= 3 x 3 / 16 x 3 + 1 x 4 / 12 x 4
= 9/48 + 4/48
= 13/48
g) 8/- 17 - (- 1/15)
= - 8/17 + 1/15
= - 8 x 15 / 17 x 15 + 1 x 17 / 15 x 17
= - 120/255 + 17/255
= - 103/255
h) 2/5 + - 2/15 - 7/12
= 2/5 - 2/15 - 7/12
= 2 x 12 / 5 x 12 - 2 x 4 / 15 x 4 - 7 x 5 / 12 x 5
= 24/60 - 8/60 - 35/60
= - 19/60