3X^2+XY+Y=15 求XY.
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3X^2+XY+Y=15 求XY.
3X^2+XY+Y=15 求XY.
3X^2+XY+Y=15 求XY.
由3X^2+XY+Y=15 得
3X^2+(X+1)Y=15
得 Y=(15-3X^2)/(X+1)
由于分母不能为0,则X不等于-1
故答案为:XY=(15X-3X³)/(X+1),其中X不等于-1
希望能帮到你.
当X=-1时,原式=3=15,不合理,故舍去;
当X不等于-1时,Y=(15-3X²)/(X+1)
所以XY=(15X-3X³)/(X+1),其中X不等于-1.
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