alguem pode me ajudar com essas pergutar falei as resposta estou precisando
A)4(x+1)=12 B)5(3-x)-4x=18 C)9x-3(2x+2)=15 D)2,5(x-2)-1,5x=1 E)3,5+8=2(x+7) F)6(3x+2)-8=-2
Soluções para a tarefa
Explicação passo-a-passo:
A) 4(x +1) = 12
4x + 4 = 12
4x = 12 -4
4x = 8
x = 8/4
x = 2
B) 5(3 - x) - 4x = 18
15 - 5x - 4x = 18
-5x - 4x = 18 - 15
-9x = 3
9x = -3
x = -3/9
x = -1/3
C) 9x - 3(2x + 2) = 15
9x - 6x - 6 = 15
3x = 15 + 6
3x = 21
x = 21/3
x = 7
D) 2,5(x -2) - 1,5x = 1
2,5x - 5 - 1,5x = 1
2,5x - 1,5x = 1 + 5
4x = 6
x = 6/4
x = 3/2
E) 3,5 + 8 = 2(x + 7)
3,5 + 8 = 2x + 14
11,5 = 2x + 14
2x + 14 = 11,5
2x = 11,5 - 14
2x = - 2,5
x = -2,5/2
F) 6(3x + 2) - 8 = -2
18x + 12 - 8 = -2
18x = -2 -12 + 8
18x = -6
x = -6/18
x = -1/3
a) 4(x+1)=12
4x+4=12
4x=12-4
x=8/4
x=2
b) 5(3-x)-4x=18
15-5x-4x=18
-9x= 18-15
-x=3/9
x=-3/9
c)9x-3(2x+2)=15
9x-6x+6=15
3x=15-6
3x=9
x=9/3
x=3
d)2,5(x-2)-1,5x=1
2,5x-5-1,5x=1
2,5x-1,5x= 1+5
x=6
e)3,5+8=2(x+7)
11,5=2x+7
2x=11,5-7
2x=4,5
x=4,5/2
x=2,25
f)6(3x+2)-8=-2
18x+12-8=-2
18x+4=-2
18x=-6
x=-6/18, simplificando: -1/3