M=4x^2-12xy+10y^2+4y+9 ,当式中的x,y各取何值时,M的值最小?并球此最小值.

因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) 若x+y的平方等于x-y的平方+m,则m=（ ）A 2xy B -2xy C 4xy D-4xy 已知(4x-7y)(5x-2y)=M-43xy+14y^2,则M等于 1 x²y-3xy²2 2x(2x-y)+y(y-2x)3 -6x(m-2n)+12(2n-m)4 3(y-x)²-(x-y)³5 4a²-366 (x-2y)²-x²7 4x³y+4x²y²+xy³8 (x+y)²-2m(x+y)+m²9 x²-9x+1810 -8x²-10x-3 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） （12x^2y-8xy^2+16xy）/-3x+2y-4=? (12x^2y-8xy^2+16xy）/-3x+2y-4=? 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 通分:x-y/2x+2y与xy/(x+y)^2 ,2mn/4m^2-9与2m-3/2m+3格式：例如：x-y/2x+2y与xy/(x+y)^2最简公分母是.x-y/2x+2y=.xy/（x+y）^2=. 解方程组：(x+y)^2-2xy-(x^2)(y^2),x+y-xy=4解方程组(x+y)^2-2xy-(x^2)(y^2)=10x+y-xy=4 x的平方-4xy+4y的平方-3x+6y=(x-2y)(x-2y+m),那么m= 若x+y=4,x^3+y^3=(x+y)(x^2-xy+y^2)z,求x^3+12xy+y^3的值. 当x-y=2xy时,求4x-3xy-4y/xy （-3x^y+2xy)-( )=4x^+xy 1-2/x+y=xy,4y+6x=xy.求xy的解? 已知X+Y=3,XY=-1,求2(X-Y)^4-9(X-Y)^2+12XY 已知x+y=-2,求代数式(6xy+10y)+[4x-2(3xy+2y-x)] 计算：[(x-y)^2-(x+y)^2]/(-4xy)=