-3(2x^2-xy)-4(-6+xy+x^2)其中x,y满足(x+2)^2+丨y-3丨=0
先化简,再求值 :(xy-3x^2)-2(xy-2x^2-1),其中x、y满足条件丨x+2丨+(y-1)^2=0
先化简再求值3(2x^2y-xy^2)-(5x^2-4xy^2)其中x y 满足|x+2|+(y-1/2)=0
-3(2x-xy)-4(-6+xy+x.其中x=1,y=-1
先化简再求值(-2xy+2x+3y)-(3xy+2x-2y)-(x+4y-xy),其中x、y满足x-y=10,xy=-4
求3xy²-4x²y-2xy²+ 5x²y的值,其中x,y满足|x-1|+(y+
(-3x^y+2xy)-( )=4x^+xy
若两个正实数x,y满足x^2+2xy-3y^2=0,求x^2+xy+y^2/x^2-xy+y^2
(x+2y-3xy)-(-2x-y+xy),其中x+y=1/2,xy=-1/2
已知正实数x y满足x-根号xy-2y=0求 x+3根号xy+2y/2x-2根号下xy-y
(x+2y-3xy)-(-2x-y+xy),其中x+y=,xy=-,求值.
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
已知A=5x^+2xy-4y^,B=-x^-4xy+y^,C=x^-xy+3y^其中xy满足|2x+1|+(y-4)^=