Question

3)encontre o valor de X nas seguintes em quais são os do 1°grau:
a)2x+3=X
b)x+2×=2+x
c)7-x=3x-5
d)5+x=2x
e)2+3×=5×
f)2×-3=10×
g)4×-1=×​

Answer 1

Resposta:

a) -3

b) 1

c) 3

d) 5

e) 2

f) $\frac{-3}{8}$

g) $\frac{1}{3}$

Explicação passo-a-passo:

a)2x+3=X

$2x+3=x \\2x-x=-3\\x=-3$

b)x+2×=2+x

$x+2x=2+x\\3x=2+x\\3x-x=2\\2x=2\\x=1$

c)7-x=3x-5

$7-x=3x-5\\-x-3x=-5-7\\-4x=-12(.-1)\\4x=12\\x=3$

d)5+x=2x

$5+x=2x\\5=2x-x\\5=x\\x=5$

e)2+3×=5×

$2+3x=5x\\2=5x-3x\\2=2x\\2=x\\x=2$

f)2×-3=10×

$2x-3=10x\\-3= 10x-2x\\8x=-3\\x=\frac{-3}{8}$

g)4×-1=×​

$4x-1=x\\-1=x-4x\\\\-3x=-1(.-1)\\3x=1\\x=\frac{1}{3}$

Espero ter ajudado :)

Bons estudos.