Sagot :
a) 5*2x - 5*8= 10x-40
b) -7*8 -7*3y = 56-21y
c)6*-z + 6*3 = -6z+18
d) 6*1-6*2a= 6-12a
e) -b*3b+b*7=-3b² +7b
f) 5c*4c-5c*6= 20c²-30c
b) -7*8 -7*3y = 56-21y
c)6*-z + 6*3 = -6z+18
d) 6*1-6*2a= 6-12a
e) -b*3b+b*7=-3b² +7b
f) 5c*4c-5c*6= 20c²-30c
A= 5(2x-8) B= -7 (8+3y)
= 5*2x-8*5 = -7*8-7*3y
= 10x-40 = -56-21y
C= 6 (-z+3) D= 6(1-2a)
= -z*6+6*3 = 6*1-2a*6
= -6z+18 = 6-12a
E=-b (3b-7) F=5c (4c-6)
= -b*3b-b*-7 = 5c*4c-6*5c
= -3b²+7b =20c²-30c
Voilà :)
= 5*2x-8*5 = -7*8-7*3y
= 10x-40 = -56-21y
C= 6 (-z+3) D= 6(1-2a)
= -z*6+6*3 = 6*1-2a*6
= -6z+18 = 6-12a
E=-b (3b-7) F=5c (4c-6)
= -b*3b-b*-7 = 5c*4c-6*5c
= -3b²+7b =20c²-30c
Voilà :)