Répondre :
coucou
ex1
A= 3/5 + 3x + x - 1/10 -5x/3 -4/7
A= 4x -5x/3 + 3/5 -1/10 -4/7
A= 7x/3 -1/14
B= x/30 -1/72 -1/3 -x/30 +1/72
B= -1/3
C= 3-2/7 +2t + 3(2t-t+4+ 2/21)
C= 19/7 +2t + 6t -3t +12 + 6/21
C= 5t +15
ex2
1) T=(5x+2)(4-7x+5x-2)
T=(5x+2)(-2x+2)
2) T= (5x+2)(-2x+2) = -10x² +10x -4x+4 = -10x² +6x +4
3) T(-2/5) = -10* (-2/5)² + 6* -2/5 + 4 = 0
T(4/3) = -10 * (4/3)² + 6* 4/3 + 4 = -52/9
ex 3
1) A= (x+1)(2x-1)-2x²
A= 2x² -x +2x -1 -2x²
A= x -1
2) A= 100 001 * 199 999 -2* 100 000²
A = (100 000 +1)* (200 000 -1) -2*100 000²
A = 20 000 000 000 - 100 000 + 200 000 -1 -2* 10 000 000 000
A= 99 999
voila j espere t avoir aider
ex1
A= 3/5 + 3x + x - 1/10 -5x/3 -4/7
A= 4x -5x/3 + 3/5 -1/10 -4/7
A= 7x/3 -1/14
B= x/30 -1/72 -1/3 -x/30 +1/72
B= -1/3
C= 3-2/7 +2t + 3(2t-t+4+ 2/21)
C= 19/7 +2t + 6t -3t +12 + 6/21
C= 5t +15
ex2
1) T=(5x+2)(4-7x+5x-2)
T=(5x+2)(-2x+2)
2) T= (5x+2)(-2x+2) = -10x² +10x -4x+4 = -10x² +6x +4
3) T(-2/5) = -10* (-2/5)² + 6* -2/5 + 4 = 0
T(4/3) = -10 * (4/3)² + 6* 4/3 + 4 = -52/9
ex 3
1) A= (x+1)(2x-1)-2x²
A= 2x² -x +2x -1 -2x²
A= x -1
2) A= 100 001 * 199 999 -2* 100 000²
A = (100 000 +1)* (200 000 -1) -2*100 000²
A = 20 000 000 000 - 100 000 + 200 000 -1 -2* 10 000 000 000
A= 99 999
voila j espere t avoir aider
Exercice 1 :
1) A = 3(1/5 + x) + 1/2(2x - 1/5) - 5/3x - 4/7
A = 3/5 + 3x + x - 1/10 - 5/3x - 4/7
A = 4x - 5/3x + 6/10 - 1/10 - 4/7
A = 12/3x - 5/3x + 5/10 - 4/7
A = 7/3x + 35/70 - 40/70
A = 7/3x - 5/70
2) B = 1/6(x/5 - 1/12) + 1/15(-5 - x/2) + 1/72
B = x/30 - 1/72 - 1/3 - x/30 + 1/72
B = -1/3
3) C = 3 - 2/7 (1 - 7t) + 3(2t - (t - 4) + 2/21)
C = 3 - 2/7 + 2t + 3(2t - t + 4 + 2/21)
C = 3 - 2/7 + 2t + 6t - 3t + 12 + 2/7
C = 5t + 15
Exercice 2 :
T = (5x + 2)(4 - 7x) + (5x - 2)(5x + 2)
1) factoriser :
T = (5x + 2)(4 - 7x + 5x - 2)
T = (5x + 2)(-2x + 2)
T = (5x + 2) * 2(-x + 1)
T = 2(5x + 2)(-x + 1)
2) développer :
T = 20x - 35x^2 + 8 - 14x + 25x^2 + 10x - 10x - 4
T = - 10x^2 + 6x + 4
T = 2(-5x^2 + 3x + 2)
3) calcul pour x = -2/5 et x = 4/3 :
T = 2(5 * (-2/5) + 2)(-(-2/5) + 1)
T = 2(-2 + 2)(2/5 + 1)
T = 2 * 0 * (2/5 + 1)
T = 0
T = 2(-5 * (4/3)^2 + 3 * 4/3 + 2)
T = 2(-5 * 16/9 + 4 + 2)
T = 2(-80/9 + 6)
T = 2(-80/9 + 54/9)
T = 2(-26/9)
T = (-52/9)
Exercice 3 :
A = (x + 1)(2x - 1) - 2x^2
1) développer :
A = 2x^2 - x + 2x - 1 - 2x^2
A = x - 1
2) A = 100 001 x 199 999 - 2 x 100 000^2
x = 100 000
A = (100 000 + 1)(2x100 000 - 1) - 2x100000^2
A = x - 1
A = 100 000 - 1
A = 99 999
1) A = 3(1/5 + x) + 1/2(2x - 1/5) - 5/3x - 4/7
A = 3/5 + 3x + x - 1/10 - 5/3x - 4/7
A = 4x - 5/3x + 6/10 - 1/10 - 4/7
A = 12/3x - 5/3x + 5/10 - 4/7
A = 7/3x + 35/70 - 40/70
A = 7/3x - 5/70
2) B = 1/6(x/5 - 1/12) + 1/15(-5 - x/2) + 1/72
B = x/30 - 1/72 - 1/3 - x/30 + 1/72
B = -1/3
3) C = 3 - 2/7 (1 - 7t) + 3(2t - (t - 4) + 2/21)
C = 3 - 2/7 + 2t + 3(2t - t + 4 + 2/21)
C = 3 - 2/7 + 2t + 6t - 3t + 12 + 2/7
C = 5t + 15
Exercice 2 :
T = (5x + 2)(4 - 7x) + (5x - 2)(5x + 2)
1) factoriser :
T = (5x + 2)(4 - 7x + 5x - 2)
T = (5x + 2)(-2x + 2)
T = (5x + 2) * 2(-x + 1)
T = 2(5x + 2)(-x + 1)
2) développer :
T = 20x - 35x^2 + 8 - 14x + 25x^2 + 10x - 10x - 4
T = - 10x^2 + 6x + 4
T = 2(-5x^2 + 3x + 2)
3) calcul pour x = -2/5 et x = 4/3 :
T = 2(5 * (-2/5) + 2)(-(-2/5) + 1)
T = 2(-2 + 2)(2/5 + 1)
T = 2 * 0 * (2/5 + 1)
T = 0
T = 2(-5 * (4/3)^2 + 3 * 4/3 + 2)
T = 2(-5 * 16/9 + 4 + 2)
T = 2(-80/9 + 6)
T = 2(-80/9 + 54/9)
T = 2(-26/9)
T = (-52/9)
Exercice 3 :
A = (x + 1)(2x - 1) - 2x^2
1) développer :
A = 2x^2 - x + 2x - 1 - 2x^2
A = x - 1
2) A = 100 001 x 199 999 - 2 x 100 000^2
x = 100 000
A = (100 000 + 1)(2x100 000 - 1) - 2x100000^2
A = x - 1
A = 100 000 - 1
A = 99 999
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