已知x+y=10,xy=24,2x^2+2y^2=

已知x-xy=10,xy-y=2,则x-y=（ ）,-2xy+x+y=（ ）. 已知x-xy=20,xy-y=-10,则x-y=( ),x+y-2xy=( ). 已知x-xy=20,xy-y=-10,则x-y=?,x+y-2xy? 已知x+y=1,xy=-2,则x²y+xy²-2xy 已知x-xy=8,xy-y=-9,求x+y-2xy的值 已知x+y=10,xy=24,2x^2+2y^2= 已知x+y=10,xy=24,求x^2+y^2 由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少? 已知x+y=-2,求代数式(6xy+10y)+[4x-2(3xy+2y-x)] 已知x+y=3,xy=-10,求（1）x平方-xy+y平方；（2）|x-y| 已知:x>0,y>0,且x- 10√xy+25y=0,求2x+√xy+3y/x+√xy-y 已知2x+xy=10,3y+2xy=6.求4x+8xy+9y=? 已知X+y=6,xy=7 求x^2y+xy^2=已知X+y=6,xy=7 x^2y+xy^2 已知:x/y=-2,求x^2-2xy-3y^2/x^-6xy 已知x+y=-10,xy=16求x²+y²,(x-y)²,(x+2)(y+2),x²-xy+y².求值！ 已知X+Y=3XY,求2X+2Y-XY除以X+Y+2XY的值,要算理.已知X+Y=3XY,求2X+2Y-XY除以X+Y+2XY的值,要算理. 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 已知x-y=3xy,则2x+3xy-2y除以x-2xy-y=?