Question

Resolva as equações aplicando a operação inversas.

Respondam pf e para amanhã VALE 100 PONTOSS


pf

Answer 1

a) 4x-1=3(x-1)

4x-1=3x-3

4x-3x=-3+1

x=-2

b)3(x-2)=2x-4

3x-6=2x-4

3x-2x=-4+6

x=2

c)2(x-1)=3x+4

2x-2=3x+4

2x-3x=4+2

-1x=6 (x-1)

x=-6

d)3(x-1)-7=15

3x-3-7=15

3x=15+3+7

3x=25

x=$\frac{25}{3}$

x=8,3

e)7(x-4)=2x-3

7x-28=2x-3

7x-2x=-3+28

5x=25

x=$\frac{25}{5}$

x=5

f)3(x-2)=4(3-x)

3x-6=12-4x

3x-4x=12+4

-1x=18 (x-1)

x=-18

g) 3(3x-1)=2(3x+2)

9x-3=6x+4

9x-6x=4+3

3x=7

x=$\frac{7}{3}$

x=2,3

h) 7(x-2)=5(x+3)

7x-14=5x+15

7x-5x=15+14

2x=29

x=$\frac{29}{2}$

x=14,5

i)3(2x-1)=-2(x+3)

6x-3=-2x-6

6x+2x=-6+3

8x=-3

x=$\frac{-3}{8}$

x=-0,3

j)5x-3(x+2)=15

5x-3x-6=15

5x-3x=15-6

2x=9

x=$\frac{9}{2}$

x=4,5

k)2x+3x+9=8(6-x)

2x+3x+9=48-8x

2x+3x+8x=48-9

13x=39

x=$\frac{39}{13}$

x=3

L) 4(x+10)-2(x-5)=0

4x+40-2x-10=0

4x-2x=-40+10

2x=-30

x=-15

M)3(2x+3)-4(x-1)=3

6x+9-4x+1=3

6x-4x=3-9-1

2x=-7

x=3,5

n)7(x-1)-2(x-5)=x-5

7x-7-2x+10=x-5

7x-2x+1x=7-10-5

6x=-8

x=$\frac{-8}{6}$

x=-1,3

o)2(3-x)=3(x-4)+15

6-2x=3x-12+15

-2x-3x=-6-12+15

-6x=1 (x-1)

6x=-1

x=$\frac{-1}{6}$

x=-0,16

P)3(5-x)-3(1-2x)=42

15-3x-3+6x=42

-3x+6x=42-15+3

3x=30

x=10

Q) (4x+6)-2x=(x-6)+10+14

4x+6-2x=x-6+10+14

4x-2x-1x=-6+10+14-6

x=12

R) (x-3)-(x+2)+2(x-1)-5=0

x-3-x-2+2x-2-5=0

1x-1x+2x=2+5+2+3

2x=12

x=6

Answer 2

a)2

b)6

d)8,3

e)5

f)18

g)2,3

h)14,5

i)0.3

j)4,5

k)3

l)15

m)3,5

n)1,3

o)0,16

p)10

q)12

r)6