Réponse :
Bonsoir
Explications étape par étape
2/5 +3/4 = 2/5 X 4/4 +3/4 X 5/5 = 8/20 + 15/20 = 23/20
2 -1/7 = 2 X 7/7 -1/7 = 14/7 -1/7 = 13/7
12/5 X 20/9 = 240/45 = 44/9
2/5 X = 3
8x X 7x² = 56 x³
30% de 70 = 21
-3 (1 -2x) = -3 +6x
(x+2) (x-3) -2 (x+2)
(x +2) (x-3 -2) = (x+2) (x -5)
f(x) = x² -4x
f(-2) = -2² -4 X -2 = +4 +8 = +4
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Réponse :
Bonsoir
Explications étape par étape
2/5 +3/4 = 2/5 X 4/4 +3/4 X 5/5 = 8/20 + 15/20 = 23/20
2 -1/7 = 2 X 7/7 -1/7 = 14/7 -1/7 = 13/7
12/5 X 20/9 = 240/45 = 44/9
2/5 X = 3
8x X 7x² = 56 x³
30% de 70 = 21
-3 (1 -2x) = -3 +6x
(x+2) (x-3) -2 (x+2)
(x +2) (x-3 -2) = (x+2) (x -5)
f(x) = x² -4x
f(-2) = -2² -4 X -2 = +4 +8 = +4