若x+y=5,xy=3,则x^2·y+2x^2·y^2+xy^2=
若x+y=5,xy=3,则x^2·y+2x^2·y^2+xy^2=
已知x+y=3 xy=-2 求代数式 (3xy+10y)+[5x-(2xy+2y-3x)]的值
(3xy)平方/(-xy)+(x-2y)平方-(x+2y)(x-2y)=
x+y=3Xy,求X+y+2Xy分之2X+2y-Xy的值是多少?
(x+2y-3xy)-(-2x-y+xy),其中x+y=,xy=-,求值.
若正实数x ,y满足2x+y+6=xy.则xy的最小值.
先化简再求值,(3x-xy+y)-2(5xy-4x+y),其中x=-2,y=3分之1.
x,y均为正,且x+y-3xy+5=0.1.求xy 的最小值 2 .求x+y的最小值
已知3/x-2/y=3 则2x-3y-xy/7xy+9y-6x 等于?
xy/x+y=1,yz/y+z=2,xz/x+z=3求x,y
(xy-x^2)乘以(xy)/(x-y)
根号X(根号X-根号Y)=3根号Y(5根号Y-根号X),求(2X-根号XY+3Y)/X+根号XY-6Y