Question

Tìm x:

x.(5-2x)+2x.(x-1)=15

Answer 1

\(x\left(5-2x\right)+2x\left(x-1\right)=15\)

\(\Rightarrow5x-2x^2+2x^2-2x=15\)

\(\Rightarrow3x=15\)

\(\Rightarrow x=5\)

Vậy x = 5.

Answer 2

\(x\left(5-2x\right)+2x\left(x-1\right)=15\)

\(\Leftrightarrow5x-2x^2+2x^2-2x=15\)

\(\Leftrightarrow3x=15\Leftrightarrow x=5\)

Answer 3

\(x.\left(5-2x\right)+2x.\left(x-1\right)=15\)

\(5x-2x^2+2x^2-2x=15\)

\(3x=15\)

\(x=5\)

Answer 4

\(x\left(5-2x\right)+2x\left(x-1\right)=15\)

\(\Rightarrow5x-2x^2+2x^2-2x=15\)

\(\Rightarrow\left(5x-2x\right)+\left(2x^2-2x^2\right)=15\)

\(\Rightarrow3x=15\)

\(\Rightarrow x=5\)