x＞0.y＞0.3x+4y=2,xy最小值为?

x＞0.y＞0.3x+4y=2,xy最小值为? 问一个数学题,3X+2=4Y,要求XY都是整数,Y最小是多少? 已知,x＞0,y＞0,x≠y,且x+y=x^2+y^2+xy,求证：1小于x+y小于4/3 x＞0y＞0 x+y+xy=2求x+y的最小值 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 填空,√x^4y²(x²+2xy+y²)=x＞0，y＞0 |x|/x+y/|y|+xy/|xy|= （-3x^y+2xy)-( )=4x^+xy 计算：[(x-y)^2-(x+y)^2]/(-4xy)= 2x^+xy-y^-4x+5y-6=? 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 化简:(x+y-4xy/x+y)*(x-y-4xy/x-y)= 因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) 已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y² 当x-y=2xy时,求4x-3xy-4y/xy 1-2/x+y=xy,4y+6x=xy.求xy的解? x^2-4xy+3y^2=（x-3y)(x-y)x^2-4xy+3y^2 怎么分解成（x-3y)(x-y) x²-4y² x+2y---------- ÷ --------分数线x²+2xy+y² x²+xyx²-4y² x+2y----------÷--------分数线x²+2xy+y² x²+xy(x+2y)(x-2y)x(x+y)=----------------(x+y)(x+y)(x+2y)(x-y)x=------(x+y)这样对了吗?