Question

atividade de Matemáticas:
a)10×-4=3×+10
b)5×+3×-7=2×+11
c)6×-×+8=3×-6
d)15+8×-2×=3-3×
e)12-5×+8×=2-2×​

Answer 1

a)10×-4=3×+10

10x -3x = 10 +4

7x = 14

x = 2

b)5×+3×-7=2×+11

8x -2x = 11 +7

6x = 18

x = 3

c)6×-×+8=3×-6

5x -3x = -6 -8

2x = -14

x = -7

d)15+8×-2×=3-3×

6x +3x = 3 -15

9x = -12

x = -12/9 = -4/3

e)12-5×+8×=2-2×

3x +2x = 2 -12

5x = -10

x = -2

Answer 2

Resposta:

a)

$10x - 4 = 3x + 10 \\ \\ 10x - 3x = 10 + 4 \\ \\ 7x = 14 \\ \\ x = \dfrac{14}{7} \\ \\ \blue {x = 2}$

b)

$5x + 3x - 7 = 2x + 11 \\ \\ 8x - 2x = 11 + 7 \\ \\ 6x = 18 \\ \\ x = \dfrac{18}{6} \\ \\ \blue{x = 3}$

c)

$6x - x + 8 = 3x - 6 \\ \\ 5x - 3x = - 6 - 8 \\ \\ 2x = - 14 \\ \\ x = - \dfrac{14}{2} \\ \\ \blue{ x = - 7}$

d)

$15 + 8x - 2x = 3 - 3x \\ \\ 6x + 3x= 3 - 15 \\ \\ 9x = - 12 \\ \\ x = - \dfrac{12 \div 3}{9 \div 3} \\ \\ \blue{x = - \dfrac{4}{3} }$

e)

$12 - 5x + 8x = 2 - 2x \\ \\ 3x + 2x = 2 - 12 \\ \\ 5x = - 10 \\ \\ x = - \dfrac{10}{5} \\ \\ \blue{x = - 2}$

Bons Estudos!