Sagot :
Bonjour,
ex 1
A=5(2-x)=10-5x
B=-2(-3x-5y)=6x+10y
C=7x(2-x)=14x-7x²
D=-3y(8-5y)=-24y+15y²
ex3
A=3(x-1)+2(2-x)
=3x-3+4-2x
=x+1
B=2-7(2-x)=2-14+7x=-12+7x
C=-(2-a)-(5a+4)
=-2+a-5a-4
=-6-4a
ex 4
A=(x-1)(2-y)
2x-xy-2+y
B=(x-2)(1+x)
=x+x²-2-2x
=x²-x-2
C=(x-7)(2-x)
=2x-x²-14+7x
=-x²+9x-14
Bonjour,
Développer les expressions:
A= 10-5x
B= 6x-10y
C= 14x-7x²
D= -24y+15y²
A= 2x-6
B= 6-24x
C= 2x-2x²
D= 10a²-8a
A= 3x-3+4-2x= x+1
B= 2-14+7x= 7x-12
C= -2+a+5a-4= 6a-6
A= 2x-2-xy+y
B= x-2+x²-2x= x²-x-2
C= 2x-x²-14+7x= - x²+9x-14
A= x-xy-3+y
B= 12-4x+3x-x²= - x²-x+12
C= 2x²+4x+2x+4= 2x²+6x+4
A= -14x+35-8x²+20x= - 8x²+6x+35
B= 2x+35+20x= 22x+35
C= 2x-5-7+4x= 6x-12
Vérifie si pas d'erreurs :)