Réponse :
bonjour
-2/9+1/6=-4/18+3/18=-1/18
-1+2/5=-5/5+2/5=-3/5
3-(-1/4)=3+1/4=12/4+1/4=13/4
8/5+1-(-3/40)=8/5+1+3/40=64/40+40/40+3/40=107/40
8/5+5/6-7/30=48/30+25/30-7/30=66/30=11/5
Explications étape par étape
C = - 2/9 + 1/6 le dénominateur commun est : 6 x 9 = 54
= - 2 x 6/54 + 1 x 9/54
= - 12/54 + 9/54
= (- 12+9)/54
= - 3/54 = - 3/3 x 18 = - 1/18
D = - 1 + 2/5 = - 1 x 5/5 + 2/5
= - 5/5 + 2/5 = - 3/5
E = + 3 - -1/4
= 12/4 + 1/4 = 13/4
H = 8/5 + 1 - - 3/40
= 8 x 8/40 + 40/40 - -3/40
= 64/40 + 40/40 + 3/40 = 107/40
I = 8/5 + 5/6 - 7/30 le dénominateur commun est : 6 x 5 = 30
= 8x6/30 + 5x5/30 - 7/30
= 48/30 + 25/30 - 7/30
= (48+25 - 17)/30
= 66/30 = 33/15
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Réponse :
bonjour
-2/9+1/6=-4/18+3/18=-1/18
-1+2/5=-5/5+2/5=-3/5
3-(-1/4)=3+1/4=12/4+1/4=13/4
8/5+1-(-3/40)=8/5+1+3/40=64/40+40/40+3/40=107/40
8/5+5/6-7/30=48/30+25/30-7/30=66/30=11/5
Explications étape par étape
Réponse :
C = - 2/9 + 1/6 le dénominateur commun est : 6 x 9 = 54
= - 2 x 6/54 + 1 x 9/54
= - 12/54 + 9/54
= (- 12+9)/54
= - 3/54 = - 3/3 x 18 = - 1/18
D = - 1 + 2/5 = - 1 x 5/5 + 2/5
= - 5/5 + 2/5 = - 3/5
E = + 3 - -1/4
= 12/4 + 1/4 = 13/4
H = 8/5 + 1 - - 3/40
= 8 x 8/40 + 40/40 - -3/40
= 64/40 + 40/40 + 3/40 = 107/40
I = 8/5 + 5/6 - 7/30 le dénominateur commun est : 6 x 5 = 30
= 8x6/30 + 5x5/30 - 7/30
= 48/30 + 25/30 - 7/30
= (48+25 - 17)/30
= 66/30 = 33/15
Explications étape par étape