:如果XY/X+Y=2,求代数式3X-5Y+3Y/-X+3XY-Y的值为 没错!
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:如果XY/X+Y=2,求代数式3X-5Y+3Y/-X+3XY-Y的值为 没错!
![:如果XY/X+Y=2,求代数式3X-5Y+3Y/-X+3XY-Y的值为 没错!](/uploads/image/z/10425996-36-6.jpg?t=%EF%BC%9A%E5%A6%82%E6%9E%9CXY%2FX%2BY%3D2%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F3X-5Y%2B3Y%2F-X%2B3XY-Y%E7%9A%84%E5%80%BC%E4%B8%BA+%E6%B2%A1%E9%94%99%21)
XY/X+Y=2
∴xy=2(x+y)
3X-5 x Y+3Y/-X+3XY-Y
=[3(x+y)-5xy]/[-(x+y)+3xy]
=[3(x+y)-10(x+y)]/[-(x+y)+6(x+y)]
=-7/5
∴xy=2(x+y)
3X-5 x Y+3Y/-X+3XY-Y
=[3(x+y)-5xy]/[-(x+y)+3xy]
=[3(x+y)-10(x+y)]/[-(x+y)+6(x+y)]
=-7/5
:如果XY/X+Y=2,求代数式3X-5Y+3Y/-X+3XY-Y的值为 没错!
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