x²-3xy-10y²+x+9y-2

若x²+xy-2y²=0,则x²+3xy+y²/x²+y² x²+xy-2y²=0则x²+3xy+y²/x²+y² 计算：4xy²-3x²y-{3x²y-[2xy²-4x²y+2(x²y-2xy²)]急 已知x²y²+x²+y²=10xy-16 求x,y 方程组{x²+y²=10(1)x²-3xy+2y²=0(2)怎么解 已知3X的²-xy+y²=10,-xy+4y²=4,则x²-y²的值等于? 十字相乘因式分解3a²-a-46y²-11xy-10x² 3x²-y²=8x²＋xy＋y²=4 a²-ab+ac-bc2ax-10ay+5by-bx3ax+4by+4ay+3bxm²+5m-mn-5nx²-y²+ax+aya²-2ab+b²-c²x³+x²y-xy²-y³4a²-b²+6a-3b9m²-6m+2n-n²x²-y²-z²+2yzx³-x²y-xy²+y³ 已知（x+3）²+|x-y+10|=0,求5x²y-[2x²y-(3xy-xy²）-3x]-2xy²-y²的值. 6x²-xy-15y²=0 求x²-2xy+4y²/2x²-3xy-3y²告诉下 6x²-xy-15y²=0 求2x²-3xy-3y²分之x²-2xy+4y² 已知2x²+xy=10,3y²+2xy=6,求4x²+8xy+y²的值 已知2x²+xy=10,3y²+2xy=6,求4x²+8xy+9y²的值 已知：x²+xy=3,xy+y²=-2 求：2x²-xy-3y² 6x²y-9xy-xy²+3x²y 3x³ - 6x²y+ 3xy² 因式分解X²-3Xy+2y²+X-2