\(3x-30\%x=-5.4\)

\(3x-\frac{3}{10}x=-\frac{27}{5}\)

\(\left(3-\frac{3}{10}\right)x=-\frac{27}{5}\)

\(\frac{27}{10}x=-\frac{27}{5}\)

\(x=-\frac{27}{5}:\frac{27}{10}\)

\(x=-2\)

= 11340 + 15660

= 27000

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

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

\(1-2x=4\)

\(2x=-3\)

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

mk giải ở dưới được 2 câu rùi nhưng ko chắc cau 2 ~~~

5465765756876

1,1/3+1/2:X= -4

         1/2:X= -4-1/3

         1/2:X= -13/3

              X=1/2 : -13/3

             X= -3/26

Giúp với

1. 1/3 + 1/2 : x = -4

   => 1/2 : x = -4 - 1/3

        1/2 : x = -13/3

      => x = 1/2 : (-13/3)

          x = -3/26

2. 3x - 30%.x = -5,4

     3x - x = -18

      2x = -18

=> x = -18 : 2

     x = -9

3. x-43 = (57 - x) - 50

  => (57 - x) . (x - 43) = -50

=> 57 - x = -50 => x = 107

=> x - 43 = -50 => x = -50 + 43 = -7

4. 3/8 - 1/6x = 1/4

 => 1/6x = 3/8 - 1/4 = 1/8

=> x = 1/8 : 1/6 = 3/4

5. 2/3 + 1/3 : x = 3/5

=> 1/3 : x = 3/5 - 2/3 = -1/15

=> x = 1/3 : (-1/15) = -5

6. x + 30%x = -1/3

 bó tay hihi!!!!

=5,4x10,6x5,4x8,6-5,4x1

=5,4x(10,6-8,6-1)

=5,4x1

=5,4

Chọn C

C

C