Question

(2x+1)^3=9x81

giúp tớ nhé nhanh nhanh giùm

Answer 1

(2x+1)³= 9.81

(2x+1)³= 729

=> (2x+1)³= 9³

=> 2x +1 =9

2x = 9-1

2x= 8

x= 8:2

x= 4

Vậy...

Answer 2

(2x+1)^3=9x81

(2x+1)³=729

<=>2x+1=9

<=>2x=8

<=>x=4

Vậy x=4

Answer 3

\(\left(2x+1\right)^3=9.81\)

\(\left(2x+1\right)^3=729\)

\(\left(2x+1\right)^3=9^3\)

\(\Rightarrow2x+1=9\)

\(\Rightarrow2x=8\)

\(\Rightarrow x=4\)

Answer 4

\(\left(2x+1\right)^3=9\times81\)

\(\Rightarrow\left(2x+1\right)^3=729\)

\(\Rightarrow\left(2x+1\right)^3=9^3\)

\(\Rightarrow2x+1=9\)

\(\Rightarrow2x=9-1\)

\(\Rightarrow2x=8\)

\(\Rightarrow x=8:2\)

\(\Rightarrow x=4\)

Answer 5

Trả lời:

\(\left(2x+1\right)^3\)\(=9\times81\)

\(\Leftrightarrow\)\(\left(2x+1\right)^3=729\)

\(\Leftrightarrow\)\(\left(2x+1\right)^3=9^3\)

\(\Leftrightarrow\)\(2x+1=9\)

\(\Leftrightarrow2x=8\)

\(\Leftrightarrow\)\(x=4\)

Vậy \(x=4\)

Hok tốt!

Vuong Dong Yet