已知x^2+2xy+y^2-10y+26=0,求(1)x+2y的平方根 (2)2y+2x的立方根

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-xy=20,xy-y=-10,则x-y=?,x+y-2xy? 已知实数xy满足x+2y 已知实数xy满足 x+y-2 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=16求x²+y²,(x-y)²,(x+2)(y+2),x²-xy+y².求值！ 已知2x+xy=10,3y+2xy=6.求4x+8xy+9y=? 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(x-50y)+xy=50y^2,求：(x-y):y=? 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xy满足约束条件y=2 2X+y 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.