"代数式3X-5Y+3Y/-X+3XY-Y的值为 "确定题目没错
分子的"-5Y"和"+3Y"是同类项
若是"代数式3X-5XY+3Y/-X+3XY-Y的值为 "则答案是
3X-5XY+3Y/-X+3XY-Y
=（3X-5XY+3Y）/（-X+3XY-Y）
=[3(X+Y)/(XY)-5]/[3-（X+Y)/(XY）]
=(3/2-5)/(3-1/2)
=-7/5
=-1.4