4-12(x-y)+9(x+y)^2RT分解因式

4-12(x-y)+9(x+y)^2RT分解因式 因式分解2x(x-y)^4 - x²(x-y)² + xy(y-x)²RT 已知x^2+y^2=2x+4y求x*y最小值RT 9x²-y²-4y-4因式分解RT 已知：x+9y=y-3x,求(x^2-y^2)/(x^2+y^2)的值RT RT,若（√2x-y）+y^2+4y+4=0,求[(x-y)^2+(x+y)(x-y)]÷2x的值 4(x+y)^2-12(x+y)(x-y)+9(+y)^2因式分解, (x+2y)(3x^2+4y^2)-(x+2y)^2(x+2y) ）RT这才是对的！(x+2y)(3*x^2+4*y^2)-(x+2y)^2 *(x-2y) 4+12(x-y)+9(x-y)^ 9(x-y)-12(y-x)^2 已知圆c1:x^2+y^12-4x-6y+9=0和圆c2:x^2+y^2+12x+6y+k=0外切 求K的值rt 已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值 |2x-y+5|与|3x-2y-2000|互为相反数,则9x-5y=?RT 4-12（x-y）+9(x-y)^2 因式分解 4-12(x-y)+9(x-y)^2因式分解 9(x-y)^2+12(x-y)+4因式分解 9(x-y)^2-12(x-y)+4=快 4+12(x-y)+9(x-y)^2用因式分解