Question

atividade resolva as contas mmc​

Answer 1

Resposta:

g) 3x/5 - x/2 = 7/2

6x/10 - 5x/10 = 35/10

x/10 = 35/10

x = 35

h) 5x/2 - 4x/3 = 7/2

15x/6 - 8x/6 = 21/6

7x/6 = 21/6

x = 3

Explicação passo-a-passo:

Answer 2

Resposta:

g)

$\dfrac{3x}{5} - \dfrac{x}{4} = \dfrac{7}{2} \\ \\ \dfrac{4 \times 3x - 5x = 10 \times 7}{20} \\ \\ 12x - 5x = 70 \\ \\ 7x = 70 \\ \\ x = \dfrac{70}{7} \\ \\ \green{ x = 10}$

h)

$\dfrac{5x}{2} - \dfrac{4x}{3} = \dfrac{7}{2} \\ \\ \dfrac{3 \times 5x - 2 \times 4x = 3 \times 7}{6} \\ \\ 15x - 8x = 21 \\ \\ 7x = 21 \\ \\ x = \dfrac{21}{7} \\ \\ \green{x = 3}$

i)

$\dfrac{7x}{3} + \dfrac{6}{5} = x \\ \\ \dfrac{5 \times 7x + 3 \times 6 = 15x}{15} \\ \\ 35x + 18 = 15x \\ \\ 35x - 15x = - 18 \\ \\ 20x = - 18 \\ \\ x = - \dfrac{18 \div 2}{20 \div 2} \\ \\ \green{x = - \dfrac{9}{10} }$

Bons Estudos!