URGENTEEEEEEEE
1.Resolva as equações:
a)-3x-17=-21
b)2x-8=-7x
c)3x+2=2x-11
d)2x=16-(x-9)
e)7.(x-1)=2.(3x+1)
f)6-x=5x+1
g)-2x+14=5x-12
h)4x-5=-6x+15
i)5x-2x=6-3x
j)-5m-7-2m-2=0
k)-14t+9=-13t+50
l)-100+4-20x=-40x
Soluções para a tarefa
Resposta:
a) x = 4/3
b) x = 8/9
c) x = - 13
d) x = 25/3
e) x = 9
f) x = 5/6
g) x = 26/7
h) x = 2
i) x = 1
j) m = -9/7
k) t = -41
l) x = 4,8
Explicação passo-a-passo:
a) -3x - 17 = -21
-3x = -21 + 17
-3x . ( -1 ) = -4 . ( -1 )
3x = 4
x = 4/3
b) 2x - 8 = -7x
2x - 8 + 7x = 0
2x + 7x = 8
9x = 8
x = 8/9
c) 3x + 2 = 2x - 11
3x + 2 - 2x = - 11
3x - 2x = - 11 - 2
x = - 11 - 2
x = - 13
d) 2x = 16 - ( x - 9 )
2x = 16 - x + 9
2x + x = 16 + 9
3x = 16 + 9
3x = 25
x = 25/3
e) 7 . ( x - 1 ) = 2 . ( 3x + 1 )
7x - 7 = 6x + 2
7x - 7 - 6x = 2
7x - 6x = 2 + 7
x = 9
f) 6 - x = 5x + 1
6 - x - 5x = 1
-x - 5x = 1 - 6
-6x . ( -1 ) = -5 . ( -1 )
6x = 5
x = 5/6
g) -2x + 14 = 5x - 12
-2x + 14 - 5x = -12
-2x - 5x = -12 - 14
-7x . ( -1 ) = -26 . ( -1 )
7x = 26
x = 26/7
h) 4x - 5 = -6x + 15
4x - 5 + 6x = 15
4x + 6x = 15 + 5
10x = 20
x = 20/10
x = 2
i) 5x - 2x = 6 - 3x
5x - 2x + 3x = 6
3x + 3x = 6
6x = 6
x = 6/6
x = 1
j) -5m - 7 - 2m - 2 = 0
-7m - 7 - 2 = 0
-7m - 9 = 0
-7m . ( -1 ) = 9 . ( -1 )
7m = -9
m = -9/7
k) -14t + 9 = -13t + 50
-14t + 9 + 13t = 50
-14t + 13t = 50 - 9
-1t . ( -1 ) = 41 . ( -1 )
t = -41
l) -100 + 4 - 20x = -40x
-100 + 4 - 20x + 40x = 0
-96 + 20x = 0
20x = 96
x = 96/20
x = 24/5
x = 4,8