Calculer la valeur de l'expression A pour x = 2/5
A = -4x² + 2x - 5
Résoudre l'équation
3(x-5)-4(x-2)=2x+1
Effectuer le calcul et mettre le résultat sous la forme d'une fraction la plus simple possible :
B = 6X7-2 / (-9)X2X(-5)
D'avance merci
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A = -4(2/5)² + 2(2/5) - 5 = -16/25 + 4/5 - 5 = 4/25 - 5 = -121/5
3(x-5)-4(x-2) = 2x+1
-x - 7 = 2x +1
3x = -8
x = -8/3
B = 6X7-2 / (-9)X2X(-5)
= (42 - 2) /(90)
= 40/90
= 4/9
A= -4(2/5)² + 2x(2/5)-5
A= -0.64+0.8-5
A= -4.84 .
3(x-5)-4(x-2) = 2x+1
-x - 7 = 2x +1
3x = -8
x = -8/3
B = 6X7-2 / (-9)X2X(-5)
B= 42-2/-18x(-5)
B=40/90
B=20/45
B=10/22.5
B=5/11.25
B=2.5/5.625
B=1.25/2.8125
B=0.625/1.43125 .