已知2x3y=2,求9

已知x=√3-√2,y=√3+√2,求x3y+xy3已知x=√3-√2,y=√3+√2,求x3y+xy3已知x=√3-√2,y=√3+√2,求x3y+xy3x3y+xy3=xy(x^2+y^2)=(√

已知x-y=-6,xy=-8,求x3y-2x2y2+xy3的值已知x-y=-6,xy=-8,求x3y-2x2y2+xy3的值已知x-y=-6,xy=-8,求x3y-2x2y2+xy3的值x³

已知：x+y=二分之一,xy=1.求x3y+2x2y2+xy3的值已知：x+y=二分之一,xy=1.求x3y+2x2y2+xy3的值 已知：x+y=二分之一,xy=1.求x3y+2x2y2+

已知x=根号3+根号2,y=根号3－根号2,求x3y+xy3已知x=根号3+根号2,y=根号3－根号2,求x3y+xy3已知x=根号3+根号2,y=根号3－根号2,求x3y+xy3

已知x+y=5,xy=3,求代数式x3y-2x平方y平方+xy3已知x+y=5,xy=3,求代数式x3y-2x平方y平方+xy3已知x+y=5,xy=3,求代数式x3y-2x平方y平方+xy3已知x+

已知x+y=4,xy=2,则x3y+x2y2+xy3的值:已知x+y=4,xy=2,则x3y+x2y2+xy3的值:已知x+y=4,xy=2,则x3y+x2y2+xy3的值:x+y=4,xy=2后者平

x3y-x2y2+2xy3=xy指的是3xy-2x2y+2x3y=xy莫?x3y-x2y2+2xy3=xy指的是3xy-2x2y+2x3y=xy莫?x3y-x2y2+2xy3=xy指的是3xy-2x2

计算题14、（12分）计算:[x(x2y2-xy)-y(x2-x3y)]÷x2y15、（1814、（12分）计算:[x(x2y2-xy)-y(x2-x3y)]÷x2y15、（18分）已知m2=n+2，

已知:|x+y+1|+|xy-3|=0,求代数式xy3+x3y的值.已知:|x+y+1|+|xy-3|=0,求代数式xy3+x3y的值.已知:|x+y+1|+|xy-3|=0,求代数式xy3+x3y的

已知x-y=1,求代数式x4-xy3-x3y-3x2y+3xy2+y4已知x-y=1,求代数式x4-xy3-x3y-3x2y+3xy2+y4已知x-y=1,求代数式x4-xy3-x3y-3x2y+3x

如果x+y=2xy=2,求1/2x3y+x2y2+1/2xy3的值.如果x+y=2xy=2,求1/2x3y+x2y2+1/2xy3的值.如果x+y=2xy=2,求1/2x3y+x2y2+1/2xy3的

已知关于x,y的方程组2x3y=-k+2,3x-2y=5k+3的解x,y的值满足x-y=5,求k的值.最后答案是k=2.已知关于x,y的方程组2x3y=-k+2,3x-2y=5k+3的解x,y的值满足

已知:4X-3Y-6Z=0,X+2Y-7Z=0(XYZ不等于0),求X+5Y+7Z/2X3Y+6Z的值已知:4X-3Y-6Z=0,X+2Y-7Z=0(XYZ不等于0),求X+5Y+7Z/2X3Y+6Z

已知实数xy满足条件|2x-3y+1|+(x3y+5)的二次方=0求式子（-2x*y）的二次方（-y的二次方）×6xy平方的值已知实数xy满足条件|2x-3y+1|+(x3y+5)的二次方=0求式子（

已知(3x+2y-5)²与|5x3y-8|互为相反数,已知(3x+2y-5)²与|5x3y-8|互为相反数,已知(3x+2y-5)²与|5x3y-8|互为相反数,依题意得

已知(3x-2y-5)²与|5x3y-8|互为相反数,已知(3x-2y-5)²与|5x3y-8|互为相反数,已知(3x-2y-5)²与|5x3y-8|互为相反数,已知(3

求x3y-xy3求x3y-xy3求x3y-xy3x3y-xy3=xy(x^2-y^2)=xy(x+y)(x-y)xy(x+y)(x-y)

3x2-12x,x2-6x+9,16m5-m,x3y-2x2y2+xy33x2-12x,x2-6x+9,16m5-m,x3y-2x2y2+xy33x2-12x,x2-6x+9,16m5-m,x3y-2

已知x、y均为实数,且满足xy+x+y=17,x2y+xy2=66,求x4+x3y+x2y2+xy3+y4的值.已知x、y均为实数,且满足xy+x+y=17,x2y+xy2=66,求x4+x3y+x2

先化简,后求值,其中x-y=1,xy=2,(1)x3y-2x2y2+xy3(2)x2+y2先化简,后求值,其中x-y=1,xy=2,(1)x3y-2x2y2+xy3(2)x2+y2先化简,后求值,其中