ME AJUDEM PFVR
PRECISA DA RESOLUÇÃO..
2) Resolver as equações abaixo:
a) 4x – 7 = 2x – 8
b) 6m – 4 = 12 – 9m
c) m + 4 – 3m = 4 + 12m
d) 3 + 4m – 9 = 6m – 4 + 12
e) –5 + 3x + 4 = 11 + 9x
f) 3(x + 2) = 15
g) –2(-m + 2) = 3(2m + 1)
h) 12m + 3(m – 1) = -2(m + 1) + 16
i) –2(y + 4) = -10 + 9(y – 1)
j) 5(x – 4) = -3 + 9(x – 1)
k) –5(k – 4 ) + 4 = 2(-2k – 2)
Soluções para a tarefa
Resposta:
1) 1
2) 16
3) m=0
4) 3
5) 12
6) x = 3
Explicação passo-a-passo:
1) 4x – 7 = 2x – 8 => 4x - 2x= – 8 +7 => 2x= – 1 =>
2) 6m – 4 = 12 – 9m.=> 6m + 9m = 12 + 4=> 15m = 16=>
3) m + 4 – 3m = 4 + 12m=> 3) m – 3m - 12m = 4 - 4 => -14m = 0 => m =0
4) 3 + 4m – 9 = 6m – 4 + 1=> 4m - 6m = – 4 + 1 +9 - 3=> -2m = 3 =>
5) –5 + 3x + 4 = 11 + 9x => + 3x - 9x = 11 +5 - 4 => - 6x = 11 +5 - 4 => -6x= 12 =>
6) 3(x + 2) = 15 => 3x + 6 = 15 => 3x = 15 -6 => 3x = 9 =>
Resposta:
a) 4x – 7 = 2x – 8
= 4x – 2x = -8 + 7 =
= 2x = -1 =
x = -1/2
b) 6m – 4 = 12 – 9m
= 6m + 9m = 12 + 4 =
= 15m = 16 =
m = 16/15
c) m + 4 – 3m = 4 + 12m
= m – 3m – 12m = 4 – 4 =
= -2m – 12m = 16 =
= -14 m = 0 =
m = 0
d) 3 + 4m – 9 = 6m – 4 + 12
= 4m – 6m = -4 + 12 – 3 + 9 =
= -2m = 9 + 6 =
= -2m = 15 =
= m = 15/-2 =
m = 13
e) –5 + 3x + 4 = 11 + 9x
= 3x – 9x = 11 – -15 – 4 =
= 6x = 11 – -1 =
= 6x = 10 =
= x = 10/6 =
x = 1,6
f) 3(x + 2) = 15
= 3x + 2 = 15 =
= 3x = 15 – 2 =
= 3x = 13 =
= x = 13/3 =
x = 4,3
g) –2(-m + 2) = 3(2m + 1)
= -2m – 4 = 6m – 3 =
= -2m + 6m = 3 + 4 =
= 4m = 7 =
= m = 7/4 =
m = 1,75
h) 12m + 3(m – 1) = -2(m + 1) + 16
= 12m + 3m – 3 = -2m – 2 + 16 =
= 12m + 3m + 2m = -2 + 16 + 3 =
= 17m = 14 + 3 =
= 17m = 17 =
= m = 17/17 =
m = 1
i) –2(y + 4) = -10 + 9(y – 1)
= -2y – 8 = -10 + 9y – 9 =
= -2y – 9y = -10 – 9 + 8 =
= -11y = -11 =
= y = -11/-11 =
y = 1
j) 5(x – 4) = -3 + 9(x – 1)
= 5x – 20 = -3 + 9x – 9 =
= 5x – 9x = -3 – 9 + 20 =
= -4x = -12 + 20 =
= -4x = 8 =
= x = 8/-4 =
x = 4
k) –5(k – 4 ) + 4 = 2(-2k – 2)
= -5k + 20 + 4 = -4k - 4 =
= -5k + 4k = -4 – 20 – 4 =
= -1k = 12 =
= k = 12/-1 =
k = 11