x+1/5*x+2/5*x+2/5*x+2=310
问题描述：
x+1/5*x+2/5*x+2/5*x+2=310
答
"1/5*x”的意思是(1/5)*x还是1/(5*x)?
答
(2x 1)/(x 2)
答
x+1/5*x+2/5*x+2/5*x+2=310
x+x+2=310
2x+2=310
x=154