Question

Giúp mình với

Answer 1

\(a,\Leftrightarrow7-x=4:\dfrac{2}{3}\)

\(\Leftrightarrow7-x=6\)

\(\Leftrightarrow x=1\)

\(b,\Leftrightarrow4x^2=27.3\)

\(\Leftrightarrow4x^2=81\)

\(\Leftrightarrow x^2=20,25\)

\(\Leftrightarrow x=\dfrac{9}{2}\)

Answer 2

2/3 (7-x) = 4

=  7-x  = 4: 2/3

= 7-x   = 6

=   x   = 7-6

=  1

x²/3 = 27/4

=> x² x 4 = 3 x 27 

=> x² x 4 = 81

=. x²        = 81 :4

=>x²        = 20,25

=>x²        = 4,5²

^{=> x = 4,5}

Answer 3

a)\(\dfrac{2}{3}\).(7-x) = 4                                                    

        7-x = 4:\(\dfrac{2}{3}\)

        7-x = 6

b)\(\dfrac{x^2}{3}\)=\(\dfrac{27}{4}\)

    x\(^2\):3 = 27 :4

   x\(^2\):3 = \(\dfrac{27}{4}\)

  x\(^2\)      = \(\dfrac{27}{4}\). 3

 x\(^2\)       = \(\dfrac{81}{4}\)

 Vì x\(^2\)= \(\dfrac{81}{4}\) nên x= \(\dfrac{18}{4}\)

Tick mik vs!!!