bonjours j ai un dm et je voudrai de l aide silvouspait merci ;)
développer
3 (2x-4) 3x(5y+4z) 2(a+2b)+3(2a-B)
factoriser
5x+15 14y-21 25xy-35xz
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Verified answer
Bonjourje suppose que ce sont 3 expressions différentes.
1) 6 x - 12
2) 15 xy + 12 xz
3) 2a + 4b + 6 a - 3b = 8 a + b
Factorisation
1) 5 ( x +3)
2) 7 ( 2 y -3)
3) 5x ( 5 y - 7 z)
3 (2x-4)
= 3 * 2x -3 * 4
= 6x -12
3 * (5y +4z)
= 3 * 5y +3 * 4z
= 15y +12z
2 (a+2b)
= 2 * a +2 * 2b
= 2a +4b
3 (2a-b)
= 3 * 2a -3 * b
= 6a -3b
Factoriser
5x +15
= 5 * x +5 * 3
= 5 (x+3)
14y -21
= 7 * 2y +7 * (-3)
= 7 (2y -3)
25xy -35xz
= 5 * 5xy +5 * (-7xz)
= 5 (xy -7xz)