Question

Tìm x biết:    a)  (4.x+7)^3=1728 vậy x = bao nhiêu?

Answer 1

\(\left(4x+7\right)^3=1728\)

\(\left(4x+7\right)^3=12^3\)

 4x +7       = 12

 4x            = 12-7

 4x            = 5

   x            = \(\frac{5}{4}\)

Answer 2

(4.x+7)³=12³

=> 4.x+7=12

4.x=5

x=5/4

x=1.25

Answer 3

(4x + 7)³ = 1728

    4x + 7  = 12

   4x          = 12 - 7

   4x          = 5

   x            = 5 : 4

   x            = 1,25

Answer 4

\(\left(4x+7\right)^3=1728\)

\(\left(4x+7\right)^3=12^3\)

\(4x+7=12\)

\(4x=12-7\)

\(4x=5\)

\(\Rightarrow x=\frac{5}{4}\)

\(\Rightarrow x=1,25\)

 

Answer 5

x=1,25