Question

Tìm y,biết: y x  5 + y x 2 + y = 720

 

Answer 1

\(\Leftrightarrow y\times\left(5+2+1\right)=720\)

\(\Leftrightarrow y=720:8=90\)

Answer 2

\(y\times5+y\times2+y=720\)

\(y\times\left(5+2+1\right)=720\)

\(y\times8=720\)

\(y=720:8\)

\(y=90\)

Answer 3

90

Answer 4

90

Answer 5

y = 90