5 [Label: Mathematics in Senior Two, Calculation in Senior Two] 1, known as 1/X+ 1/Y=5, find the value of 2X-3XY+2Y/X+2XY+Y ("/"is a semicolon and "-"is a minus sign.
This is the 19 in the second volume of Huanggang Innovation AB (Hebei Education Edition). Answer: 5 popularity: 6 solution time: February 9, 200914: 53.
According to x = 1/X+ 1/Y=5, substitute x = 1/5-x into 2x-30. 75-3xy+ 1- 1/5y- 1/5x+xy+ 1/50- 10y- 1/ 10x+。
I am also a junior two student, but I really can't provide the most definite information. I'm sorry to take the liberty of asking who you are, where you go to school and where you come from.