Question

Resolva as Equações: Resposta completa por favor <3

1- 3x-30=9
2- 4x-2x+21=43
3- x + x + x +=130
2 3 4
4- 800x+200=500x+800
5- 150 = x
80 400
6- 2 x + 4 x + 1 x - 77 = 100
3 5 2
7- 4x - 2 x =
5 3
8- x + x + x =
5 5 10
9- 400x +150 = 200x + 750
10- 2x- x =
3 12

Answer 1

3x-30=9

3x=9+30

3x=39

x=39/3

x=13

b)4x-2x+21=43

2x=43-21

2x=22

x=22/2

x=11

c)

$\frac{x}{2} + \frac{x}{3} + \frac{x}{4} = 130$

6x + 4x +3x=1560

13x=1560

x=1560/13

x=120

d) 800x +200=500x+800

800x-500x = 800-200

300x = 600

X =600/300

x=2

e)

$\frac{150}{80} = \frac{x}{400}$

$\frac{15}{8} = \frac{x}{400}$

8x=6000

x=6000/8

x=750

f)

$\frac{2x}{3} + \frac{4x}{5} + \frac{x}{2} - 77 = 100$

$\frac{2x}{3} + \frac{4x}{5} + \frac{x}{2} = 23$

20x + 24x + 15x = 345

59x=345

x=345/59

g) não entendi

h) não entendi

i)400x + 150 = 200x + 750

400x-200x=750-150

200x=600

x=600/200

x=3

j)não entendi