Réponse :
Explications étape par étape
Bonjour
Calculer :
-3/5 + 9/20
= (-3 x 4)/(5 x 4)
= (-12/20) + 9/20
= (-3/20)
5/12 - 3/8
= (5 x 2)/(12 x 2) - (3 x 3)/(8 x 3)
= 10/24 - 9/24
= 1/24
-2 - (-4/3)
= -2 + 4/3
= (-2 x 3)/3 + 4/3
= -6/3 + 4/3
= (-2/3)
-8/9 : 7/4
= -8/9 x 4/7
= (-8 x 4)/(9 x 7)
= -32/63
11/3 : (-5/4)
= 11/3 x -4/5
= (-4 x 11)/(3 x 5)
= (-44/15)
(-2/15 + 3/5) : (-2 + 3/10)
= (-2/15 + (3 x 3)/(5 x 3)) : ((-2 x 10)/10 + 3/10)
= (-2/15 + 9/15) : (-20/10 + 3/10)
= 7/15 : (-17/10)
= 7/15 x -10/17
= (-10/15) x 7/17
= (-2 x 5)/(3 x 5) x 7/17
= -2/3 x 7/17
= (-2 x 7)/(3 x 17)
= (-14/51)
