Bonjour
1
1) A : 2x + 1 = 31 ; 2x + 1(-1) = 31(-1) ; 2x = 30 ; x = 15
C : 3x + 1 = 2x + 16 ; 3x + 1(-1) = 2x + 16(-1) ; 3x(-2x) = 2x(-2x) = 15 ; x = 15
2) B : 9x - 1 = 5 ; 9x - 1(+1) = 5(+1) ; 9x = 6 ; 9x/9 = 6/9 ; x = 2/3
3) A : 2x + 4 = 5x +4 ; 2*0+4 = 4 et 5*0 + 4 = 4 donc 2*0 + 4 = 5*0 +4
B : 2(x + 3) = 6 ; 2(0+3) = 2*3 = 6 donc 2(0 + 3) = 6
C : 2x = 4(x + 2)-8 ; 2*0=0 et 4(0+2)-8 = 4*2 -8 = 0 donc 2*0 = 4(0 + 2)-8
2
1) C : 3t = 5 (1er membre : 3t + 7 donc (3t + 7)-7 = 3t , 2eme membre 12 donc 12 - 7 = 5)
2) 5y - 2 = 3y + 1 ; 5y - 2(+2) = 3y + 1(+2) ; 5y = 3y + 3 ; 5y(-3y) = 3y(-3y) + 3
2y = 3 ; 2y/2 = 3/2 ; y =3/2
A : 2y = 3 ; 2y/2 = 3/2 ; y = 3/2
B : 10y - 7 = 8 ; 10y - 7(+7) = 8(+7) ; 10y = 15 ; 10y/10 = 15/10 ; y = 3/2
C : 2(5y-3) = 9 ;10y-6 = 9 ; 10y - 6(+6) = 9(+6) ; 10y = 15 ; 10y/10 = 15/10; y = 3/2
3) B
3
1) C : (x+5)*3 = 3x+15
2) B
3) C
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Bonjour
1
1) A : 2x + 1 = 31 ; 2x + 1(-1) = 31(-1) ; 2x = 30 ; x = 15
C : 3x + 1 = 2x + 16 ; 3x + 1(-1) = 2x + 16(-1) ; 3x(-2x) = 2x(-2x) = 15 ; x = 15
2) B : 9x - 1 = 5 ; 9x - 1(+1) = 5(+1) ; 9x = 6 ; 9x/9 = 6/9 ; x = 2/3
3) A : 2x + 4 = 5x +4 ; 2*0+4 = 4 et 5*0 + 4 = 4 donc 2*0 + 4 = 5*0 +4
B : 2(x + 3) = 6 ; 2(0+3) = 2*3 = 6 donc 2(0 + 3) = 6
C : 2x = 4(x + 2)-8 ; 2*0=0 et 4(0+2)-8 = 4*2 -8 = 0 donc 2*0 = 4(0 + 2)-8
2
1) C : 3t = 5 (1er membre : 3t + 7 donc (3t + 7)-7 = 3t , 2eme membre 12 donc 12 - 7 = 5)
2) 5y - 2 = 3y + 1 ; 5y - 2(+2) = 3y + 1(+2) ; 5y = 3y + 3 ; 5y(-3y) = 3y(-3y) + 3
2y = 3 ; 2y/2 = 3/2 ; y =3/2
A : 2y = 3 ; 2y/2 = 3/2 ; y = 3/2
B : 10y - 7 = 8 ; 10y - 7(+7) = 8(+7) ; 10y = 15 ; 10y/10 = 15/10 ; y = 3/2
C : 2(5y-3) = 9 ;10y-6 = 9 ; 10y - 6(+6) = 9(+6) ; 10y = 15 ; 10y/10 = 15/10; y = 3/2
3) B
3
1) C : (x+5)*3 = 3x+15
2) B
3) C