Question

Tìm x biết : x .(5-2x)+2x.(x-1)=15

 

Answer 1

x(5 - 2x) + 2x(x - 1) = 15
=> 5x - 2x\(^2\)+ 2x\(^2\)- 2x = 15
=> 5x - 2x = 15
=> 3x = 15
=> x = 5
K cho mình nhé! Cảm ơn

Answer 2

k cho mk nhé

Answer 3

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

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

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

\(\Rightarrow3x=15\)

\(\Rightarrow x=15:3\)

\(\Rightarrow x=5\)

Vậy x = 5

_Chúc bạn học tốt_