①﹙2x+5﹚/﹙3x-6﹚+﹙4-5x﹚/﹙2x-4﹚=0②若2x²-3xy+y²=0求x/y+y/x的值

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①﹙2x+5﹚/﹙3x-6﹚+﹙4-5x﹚/﹙2x-4﹚=0②若2x²-3xy+y²=0求x/y+y/x的值
①﹙2x+5﹚/﹙3x-6﹚+﹙4-5x﹚/﹙2x-4﹚=0②若2x²-3xy+y²=0求x/y+y/x的值

①﹙2x+5﹚/﹙3x-6﹚+﹙4-5x﹚/﹙2x-4﹚=0②若2x²-3xy+y²=0求x/y+y/x的值
由①得,(4x+10+12-15x)/(6x-12)=0,即x=2;由于x=2,分母=0,故此式无意义;
由②得,(x-y)*(2x-y)=0,即x=y或2x=y;
因此,x/y+y/x的值,存在①式的话,无意义;若按②式计算分为2种情况:
一,若x=y,则x/y+y/x的值为 2;
二,若2x=y,则x/y+y/x的值为 5/2.

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