Réponses

Meilleure réponse !
2013-11-01T17:46:23+01:00
Ecrire sans parenthèses
1.a.(5y) *(6y)=30y²
b.(6+x)*(3x)=18x+3x²
c.(5x)*(x+8)=5x²+40x
d.(5+y)*(6+y)=30+5y+6y+y²=y²+11y+30

2a.(7+x)²=49+14x+x²
b.(7x)²=49x²
c.(7-x)²=49-14x+x²
d.(x-7)²=x²-14x+49

3a.4(t-6)+3(5-t)=4t-24+15-3t=t-9
b.10(1/5x+3)-15x=10/5x+30-15x=2x-30-15x=-13x-30
c.5/3(-6x+3/2)=-30/3x+15/6=-10x+5/2
d.5(x+1/3)-4(x+3)=5x+5/3-(4x+12)=5x+5/3-4x-12=x+5/3-36/3=x-31/3

Factoriser
1.a(3t+7)²=9t²+42t+49
b.(y-7)²=y²-14y+49
c.(a+5)²=a²+10a+25
d.(x-1)²=x²-2x+1

a.(4y+6)²=16y²+48y+36
b.(y-1.5)²=y²-3y+2.25
c.(0.1a+5)²=0.01a²+a+25
d.(0.25x-2)²=0.0625x²-2x+4