Question

1 ) Resolva as seguintes equações sendo U = R

Answer 1

Resposta:

a)

$x - 13 = 57 \\ \\ x = 57 + 13 \\ \\ \pink{x = 70}$

b)

$x + 18 = 15 \\ \\ x = 15 - 18 \\ \\ \pink{ x = - 3}$

c)

$x + 13 = 29 \\ \\ x = 29 - 13 \\ \\ \pink{x = 16}$

d)

$2x = 144 \\ \\ x = \frac{144}{2} \\ \\ \pink{ x = 72}$

e)

$- 3x = 315 \\ \\ x = \dfrac{315}{ - 3} \\ \\ \pink{ x = - 105}$

f)

$4x = 182 \\ \\ x = \dfrac{182 \div 2}{4 \div 2} \\ \\ \pink{ x = \dfrac{91}{2} }$

g)

$\dfrac{x}{3} = 15 \\ \\ x = 3 \times 15 \\ \\ \pink{x = 45}$

h)

$\dfrac{7}{2} x = - 8 \\ \\ 7x = 2( - 8) \\ \\ 7x = - 16 \\ \\ \pink{x = - \dfrac{16}{7} }$

i)

$\dfrac{x}{5} = \dfrac{1}{4} \\ \\ 4x = 5 \times1 \\ \\ 4x = 5 \\ \\ \pink{ x = \dfrac{5}{4} }$

j)

$\dfrac{2}{11} x = - \dfrac{7}{2} \\ \\ 2x \times 2 = 11 \times 7 \\ \\ 4x = 77 \\ \\ \pink {x = \dfrac{77}{4} }$

k)

$- \dfrac{5x}{7} - 7 = - 5 \\ \\ - \dfrac{5x}{7} = - 5 + 7 \\ \\ - \dfrac{5x}{7} = 2 \\ \\ - 5x = 7 \times 2 \\ \\ - 5 x = 14 \\ \\ \pink{ x = - \dfrac{14}{5} }$

Bons Estudos!