Bonjour ,
1)
Baisse de 70 € et 350 x 20/100=70
2)
(2x-4)²=4x²-16x+16
3)
(2x+5)(3x+2)-(2x+5)(2x+5)=(2x+5)[(3x+2)-(2x+5)=(2x+5)(3x+2-2x-5)=
=(2x+5)(x-3)
4)
(3x-5)(3x+5)=(3x)²-5²=9x²-25
5)
4x²-36=(2x)²-6²=(2x-6)(2x+6)
6)
19/3 : 4/9=(19/3) x (9/4)=(19 x 3 x 3 ) / (3 x 4)=19 x 3/4=57/4
Réponse:
1:c
2:A
3:b
4b
5a
6a
boun chouns
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Bonjour ,
1)
Baisse de 70 € et 350 x 20/100=70
2)
(2x-4)²=4x²-16x+16
3)
(2x+5)(3x+2)-(2x+5)(2x+5)=(2x+5)[(3x+2)-(2x+5)=(2x+5)(3x+2-2x-5)=
=(2x+5)(x-3)
4)
(3x-5)(3x+5)=(3x)²-5²=9x²-25
5)
4x²-36=(2x)²-6²=(2x-6)(2x+6)
6)
19/3 : 4/9=(19/3) x (9/4)=(19 x 3 x 3 ) / (3 x 4)=19 x 3/4=57/4
Réponse:
1:c
2:A
3:b
4b
5a
6a
boun chouns