Réponse :
13/7 - 20/7 = -7/7 =-1
-5/4 + 2/3 = (-5*3)/(4*3) + (2*4)/(3*4) = -15/12+8/12 = -7/12
1/6-5/3 = 1/6-(5*2)/(3*2) = 1/6-10/6 = -9/6 = -3/2
-5/3*2/7 =(-5*2)/(3*7) = -10/21
12/-5*-15/8 = on simplifie -15 et -5 par 5 et 12 et 8 par 4=
3*3/2 = 9/2 ou sans simplifier : (12*-15)/(-5*8) = -180/-40 = 18/4 = 9/2
2/9diviser par -7/5 = 2/9*-5/7 = -10/63
-5/14 diviser par -10/-21 = -5*21/14*10=-105/140=-3/4
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-5/4 + 2/3 = -1
1/6 - 5/3 = -3/2
-5/3 . 2/7 = -10/21
12/-5 . -15/8 = 9/2
2/9 : -7/5 = -10/63
-5/14 : -10/-21 = -3/4
Réponse :
13/7 - 20/7 = -7/7 =-1
-5/4 + 2/3 = (-5*3)/(4*3) + (2*4)/(3*4) = -15/12+8/12 = -7/12
1/6-5/3 = 1/6-(5*2)/(3*2) = 1/6-10/6 = -9/6 = -3/2
-5/3*2/7 =(-5*2)/(3*7) = -10/21
12/-5*-15/8 = on simplifie -15 et -5 par 5 et 12 et 8 par 4=
3*3/2 = 9/2 ou sans simplifier : (12*-15)/(-5*8) = -180/-40 = 18/4 = 9/2
2/9diviser par -7/5 = 2/9*-5/7 = -10/63
-5/14 diviser par -10/-21 = -5*21/14*10=-105/140=-3/4