Sagot :
bonjour
A = - 6 x + 15 - 2 x² + 6 x + 5 x - 15
A = - 2 x² + 5 x
B = 6 a - 8 a² - 15 + 12 a - 10 + 2 a
B = - 8 a² + 20 a - 25
C = - ( 3 z - 6 - 4 z² + 8 z )
= - 3 z + 6 + 4 z² - 8 z
= 4 z² - 11 z + 6
D = - 10 r + 15 r - 2 r² - 5 r - 4 r - 10
= - 2 r² - 4 r - 10
Bonjour,
A=3(-2x+5)+(-2x+5)(x-3)
A=-6x+15+(-2x²+6x+5x-15)
A=-6x+6x+15-15-2x²+5x
A=-2x²+5x
B=(2a-5)(3-4a)-2(5-a)
B=6a-8a²-15+20a-10+2a
B=-8a²+28a-25
C=-(3-4z)(z-2)
C=-(3z-6-4z²+8z)
C=-(-4z²+11z-6)
C=4z²-11z+6
D=-5r(2-3r)+(-r-2)(2r+5)
D=-10r+15r²-2r²-5r-4r-10
D=13r²-19r-10