Question

Cho ( x + 2) + (x + 4) + (x + 6) + (x + 8) + x = 120. Giá trị của x là 

Answer 1

mình thử 20 là ok

Answer 2

\(\left(x+2\right)+\left(x+4\right)+\left(x+6\right)+\left(x+8\right)+x=120\)

\(\left(x+x+x+x+x\right)+\left(2+4+6+8\right)=120\)

\(x\times5+20=120\)

\(x\times5=120-20\)

\(x\times5=100\)

\(x=100:5\)

\(x=20\)

Answer 3

\(\left(x+2\right)+\left(x+4\right)+\left(x+6\right)+\left(x+8\right)+x=120\)

\(x+2+x+4+x+6+x+8+x=120\)

\(\left(x+x+x+x+x\right)+\left(2+4+6+8\right)=120\)

\(5x+20=120\)

\(5x=100\)

\(x=20\)

Answer 4

\(\left(x+2\right)+\left(x+4\right)+\left(x+6\right)+\left(x+8\right)+x=120\)

\(x+2+x+4+x+6+x+8+x=120\)

\(5x+20=120\)

\(5x=100\)

\(x=20\)