A与2x²y-5xy²+6y³的和为3x²-4x²y+5y²

设A=2x²-3XY+Y²,B=4X²-6XY-3Y²,且（X-5)和（Y+2) 因式分解x的5次方y-x³y+2x²y-xy x、y为实数,求5x²+2y²-2xy-4x-4y+9的最小值 求5x²y、﹣2x²y、2xy²、﹣4x²y的和 A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x= 设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若x 求3xy²-4x²y-2xy²+ 5x²y的值,其中x,y满足|x-1|+(y+ 已知:x²-6xy+9y²=0,求代数式3x+5y/4x²-y²×（2x+y)的 单项式5x²y,3x²y²,-4xy²的和 单项式5X²Y、3X²Y²、-4XY²的和是多少 一个多项式与2x²y³的积为8x^ 5 y³-6x^4 y^4 +4x³y^5- 已知xy²=-6,求xy(x^3y^7-3x^2y^5-11.5y)的值