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