x∧2+y∧2=13,x∧2-4xy+4y∧2=1解方程组,

(-1/3xy)∧2*[3xy(2x-y)-3x(2xy-4y∧2)] （-3x^y+2xy)-( )=4x^+xy 如果x∧2-3xy-4y∧2=0则x/y是多少 x,y∈R,x∧2+y∧2=4,求xy/(x+y-2)的最小值 已知x+y=6,xy=-3,则x∧y+xy∧2= X×X-2XY-Y×Y+2X-2Y+2=02X×2X-4XY-2Y×2Y+3X-3Y+4=0X×X+2XY+Y×Y+X+Y-56=0X×X-2XY+Y×Y-X+Y-12=0X×X-3XY+Y×Y=-13X×3X-XY+3Y×3Y=13 两个在一起的方程之间有所联系（要求一步一步写出来） 当x-y=2xy时,求4x-3xy-4y/xy 1-2/x+y=xy,4y+6x=xy.求xy的解? 因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 4x∧2y-［6xy-3（4xy-2）+4x∧2y］+1 计算：[(x-y)^2-(x+y)^2]/(-4xy)= 2x^+xy-y^-4x+5y-6=? (x^2+2xy+y^2-4xy)*(x^2-2xy+y^2+4xy) 已知x-y=4xy,求2x+3xy-2y/x-2xy-y的值 x-y=4xy,试求2x+3xy-2y/x-2xy-y 已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值! x-y=4xy,试求2x+3xy-2y/x-2xy-y