Question

tìm x

a, 2/3x - 4/9 =-5/27

b, 2/3x+4/9=5/27

c, x:1,2 = 5,4 :6

d, 1,68:1,2 =5,4:x

e, ( 1-2x)^2+1 = 10

f, (1-2x)^2-6 = 10

Answer 1

a,\(\dfrac{2}{3}x-\dfrac{4}{9}=-\dfrac{5}{27}\)

\(\dfrac{2}{3}x=\dfrac{17}{27}\)

\(x=\dfrac{17}{18}\)

b,\(\dfrac{2}{3}x+\dfrac{4}{9}=\dfrac{5}{27}\)

\(\dfrac{2}{3}x=-\dfrac{7}{27}\)

\(x=-\dfrac{7}{18}\)

c,\(x:1,2=5,4:6\)

\(x:1,2=0,9\)

\(x=1,08\)

d,\(1,68:1,2=5,4:x\)

\(1,4=5,4:x\)

\(x=\dfrac{27}{7}\)

e,\(\left(1-2x\right)^2+1=10\)

\(\left(1-2x\right)^2=9\)

\(1-2x=3\)

\(2x=-2\)

\(x=-1\)

f,\(\left(1-2x\right)^2-6=10\)

\(\left(1-2x\right)^2=16\)

\(1-2x=4\)

\(2x=-3\)

\(x=-\dfrac{3}{2}\)