Question

Me ajudem nesses cálculo

A) 5× - 10 = 2 - 3×
B) × + 5 = 45 - 7×
C) 12× - 3× + 10 = 4× - 40
D ) 5(× - 3) =6 + 2×

Answer 1

Resposta:

a)3/2

b)5

c)-10

d)7

Explicação passo-a-passo:

a)5x-10=2-3x

5x+3x=2+10

8x=12

x=12/8

x=1,5 ou 3/2

b)x+5=45-7x

x+7x=45-5

8x=40

x=40/8

x=5

c)12x-3x+10=4x-40

12x-3x-4x=-40-10

5x=-50

x=-50/5

x=-10

d)5(x-3)=6+2x

5x-15=6+2x

5x-2x=6+15

3x=21

x=21/3

x=7

Answer 2

Resposta:

Olá!

R.: a. $x=\frac{3}{2}$

b. $x=5$

c. $x=-10$

d. $x=7$

Explicação passo-a-passo:

a. $5x-10=2-3x$

$5x+3x=2+10$

$8x=12$

$x=\frac{12}{8}$ ÷ 4

$x=\frac{3}{2}$

b. $x+5=45-7x$

$x+7x=45-5$

$8x=40$

$x=\frac{40}{8}$

$x=5$

c. $12x-3x+10=4x-40$

$12x-3x-4x=-40-10$

$5x=-50$

$x=-\frac{50}{5}$

$x=-10$

d.  $5.(x-3)=6+2x$

$5x-15=6+2x$

$5x-2x=6+15$

$3x=21$

$x=\frac{21}{3}$

$x=7$

Bons Estudos!