已知y减x减2xy等于0,求3x加xy减3y除以y减xy减x的值

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已知y减x减2xy等于0,求3x加xy减3y除以y减xy减x的值
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已知y减x减2xy等于0,求3x加xy减3y除以y减xy减x的值
已知y减x减2xy等于0,求3x加xy减3y除以y减xy减x的值

已知y减x减2xy等于0,求3x加xy减3y除以y减xy减x的值
y-x-2xy=0
(3x+xy-3y)/(y-xy-x)
=(3x+6xy-5xy-3y)/(y+xy-2xy-x)
=[-3(y-x-2xy)-5xy]/(y-x-2xy)+xy
=(0-5xy)/(0+xy)
=-5xy/xy
=-5

y-x-2xy=0
xy=(y-x)/2
(3x+xy-3y)/(y-xy-x)
=[3x+(y-x)/2-3y]/[y-(y-x)/2-x]
=[-5/2(y-x)]/[(y-x)/2]
=-5

y减x减2xy等于0
则,y-x=2xy

3x加xy减3y除以y减xy减x
=[3(x-y)+xy]÷[(y-x)-xy]
=(-6xy+xy)÷(2xy-xy)
=-5xy÷xy
=-5

由已知得

所以