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Sorayaa22
@Sorayaa22
May 2019
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Bonjours à tous merci de bien vouloir m'aider svp
Il faut factoriser ses expressions:
A= 36-25xau carré
B=100+60x=9xau carré
C=2i(i+1)+2i(2+i)
D=bau carré - 10b+25
E=(2-x)au carré +(2-x)(9+x)
F=(5x+1)au carré - 81
G=(7d+2)au carré -(3d+4)au carré
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GHANAMI
Bonsoir voici une solution :
A= 6²-(5x)²=(6-5x)(6+5x)
B= 100+60x+9x²=(3x)²+2(3x)(10)+10²=(3x+10)²
C=2i(i+1)+2i(2+i) = 2i((i+1)+(2+i))=2i(2i+3)
D= b²-10b+25 = b²-2(5)(b)+5² = (b-5)²
E= (2-x)²+(2-x)(9+x) = (2-x)((2-x)+(9+x))=11(2-x)
F=(5x+1)²-9²=(5x+1-9)(5x+1+9)=(5x-8)(5x+10)
G=(7d+2)²-(3d+4)²=((7d+2)+(3d+4))
((7d+2)-(3d+4))
=(10d+6)(4d-2)
1 votes
Thanks 1
Mtnj03
A= 36-25x² =(6)² - (5x)² soit la forme a² - b²= (a +b)(a -b) donc on aura
A= (6 +5x)(6 -5x)
B=100+60x=9x² ⇒ B= 9x² -60x -100
C=2i(i+1)+2i(2+i) on sait que i² =-1
donc C=2i² +2i +4i +2i² = 4i² +6i ⇒
C= 2i(2i +3)
D=b² - 10b+25
E=(2-x)²+(2-x)(9+x) ⇒ (2-x)(2-x) + (2-x)(9+x) ⇒ (2-x)( 2-x +9 +x) ⇒
(2-x)(11) ⇒
E = 11(2-x)
F=(5x+1)² - 81 ⇒ F=(5x+1)² - (9)² soit la
forme
a² - b²= (a +b)(a -b) donc on aura F=(5x+1+9)(5x +1 -9) ⇒
F=(5x+10)( 5x -8)
G=(7d+2)² -(3d+4)² soit la forme a² - b²
= (a +b)(a -b) donc on aura
G=(7d+2)² -(3d+4)² ⇒
G=(7d+2+3d +4)(7d +2 -3d-4)
⇒
G=(10d +6)(4d -2)
0 votes
Thanks 0
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Lista de comentários
A= 6²-(5x)²=(6-5x)(6+5x)
B= 100+60x+9x²=(3x)²+2(3x)(10)+10²=(3x+10)²
C=2i(i+1)+2i(2+i) = 2i((i+1)+(2+i))=2i(2i+3)
D= b²-10b+25 = b²-2(5)(b)+5² = (b-5)²
E= (2-x)²+(2-x)(9+x) = (2-x)((2-x)+(9+x))=11(2-x)
F=(5x+1)²-9²=(5x+1-9)(5x+1+9)=(5x-8)(5x+10)
G=(7d+2)²-(3d+4)²=((7d+2)+(3d+4))((7d+2)-(3d+4))
=(10d+6)(4d-2)
A= (6 +5x)(6 -5x)
B=100+60x=9x² ⇒ B= 9x² -60x -100
C=2i(i+1)+2i(2+i) on sait que i² =-1
donc C=2i² +2i +4i +2i² = 4i² +6i ⇒ C= 2i(2i +3)
D=b² - 10b+25
E=(2-x)²+(2-x)(9+x) ⇒ (2-x)(2-x) + (2-x)(9+x) ⇒ (2-x)( 2-x +9 +x) ⇒
(2-x)(11) ⇒ E = 11(2-x)
F=(5x+1)² - 81 ⇒ F=(5x+1)² - (9)² soit la forme a² - b²= (a +b)(a -b) donc on aura F=(5x+1+9)(5x +1 -9) ⇒
F=(5x+10)( 5x -8)
G=(7d+2)² -(3d+4)² soit la forme a² - b²= (a +b)(a -b) donc on aura
G=(7d+2)² -(3d+4)² ⇒ G=(7d+2+3d +4)(7d +2 -3d-4) ⇒
G=(10d +6)(4d -2)