Bonjour !
A ) 7/24-5/8
7/24 - 5x3/8x3 =
7/24 - 15/24 = -8/24 = -1/3
B) -5/18 - 11/6
B = -5/18-11x3/6x3 =
B = -5/18 - 33/18 = -38/18 = -19/9
C) 11/45-(-5/9)
C = 11/45 - (-5x5/9x5) =
C = 11/45 + 25/45 = 36/45 = 4/5
D) -8/7 - (-10/21)
D = -8x3/7/3 + 10/21
D = -24/21 + 10/21 = -10/21
Bon courage .
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Bonjour !
A ) 7/24-5/8
7/24 - 5x3/8x3 =
7/24 - 15/24 = -8/24 = -1/3
B) -5/18 - 11/6
B = -5/18-11x3/6x3 =
B = -5/18 - 33/18 = -38/18 = -19/9
C) 11/45-(-5/9)
C = 11/45 - (-5x5/9x5) =
C = 11/45 + 25/45 = 36/45 = 4/5
D) -8/7 - (-10/21)
D = -8x3/7/3 + 10/21
D = -24/21 + 10/21 = -10/21
Bon courage .