Question

Como calcular as seguintes equações
A) 7x+3x=100
B)25-4x= -3x
C)3x=37-7
D) 12x-11= +6x+7
E)x/11 =6
F) 3x=39
G)6x/2=12
H) 4+2x=8
I) 7x-5=3x+40
J) -9x+10=x-90

Answer 1

Resposta:

a)x=10

b)x=25

c)x=10

d)x=3

e)x=66

f)x=13

g)x=4

h)x=2

i)x=45/4

j)x=10

Explicação passo-a-passo:

a)

$7x + 3x = 100$

$10x = 100$

$x = \frac{100}{10}$

$x = 10$

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b)

$25 - 4x = - 3x$

$25 = - 3x + 4x$

$x = 25$

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c)

$3x = 37 - 7$

$3x = 30$

$x = \frac{30}{3}$

$x = 10$

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d)

$12x - 11 = + 6x + 7$

$12x - 6x = 7 + 11$

$6x = 18$

$x = \frac{18}{6}$

$x = 3$

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e)

$\frac{x}{11} = 6$

$x = 6 \times 11$

$x = 66$

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f)

$3x = 39$

$x = \frac{39}{3}$

$x = 13$

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g)

$\frac{6x}{2} = 12$

$6x = 12 \times 2$

$6x = 24$

$x = \frac{24}{6}$

$x = 4$

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h)

$4 + 2x = 8$

$2x = 8 - 4$

$2x = 4$

$x = \frac{4}{2}$

$x = 2$

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i)

$7x - 5 = 3x + 40$

$7x - 3x = 40 + 5$

$4x = 45$

$x = \frac{45}{4}$

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j)

$- 9x + 10 = x - 90$

$90 + 10 = x + 9x$

$100 = 10x$

$\frac{100}{10} = x$

$x = 10$

Espero ter ajudado!

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