2x²-4xy+4y²-8x+2016的最小值怎样求

计算：4xy²-3x²y-{3x²y-[2xy²-4x²y+2(x²y-2xy²)]急 x²-4y²/x²+2xy+y²÷x+2y/2x²+2xy 计算x²-x/x²×x/1-x和x²-4y²/x²+2xy+y²÷x+2y/x²+xy 4x²y-xy² 6x²-xy-15y²=0 求x²-2xy+4y²/2x²-3xy-3y²告诉下 6x²-xy-15y²=0 求2x²-3xy-3y²分之x²-2xy+4y² 因式分解2x(x-y)^4 - x²(x-y)² + xy(y-x)²RT 已知x² -XY = 2,Y² -XY= 5,求x² - 4x Y+ Y² = 2x² + xY -3Y² = x² 已知x² -XY = 2,Y² -XY= 5,求x² - 4x Y+ Y² = 2x² + xY -3Y² = x² + xY- 2Y² =求x² - 4x Y+ Y² = 1.(x+y)²-4xy=( )²2.x²-（ ）+25y²=（ )²3.x²-8x²y²+16y四次方=（ ）²4.7.2²-2.8²= . 1 3x²+4xy-y²=2 4xy+1-4x²-y²= 单项式2xy,6x²y²,-3xy,-4x²y²的和为-------------- 求单项式2xy,6x² y²,-3xy,-4x²y²的和. 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? 已知x²+xy=3,xy+y²=—2,求x²-y²的值?x²+4xy+3y²的值?2x²-xy-3y 已知,x²+2y²-2xy-4y+4=0,求x²+y²的值 分式的除法运算x²－4y²/x²+y²+2xy÷2y+x/x²+xy 分式的乘除法计算：：x²-4y²/x²+2xy+y²÷x+2y/x²+xy 分式的乘除法计算：：x²-4y²/x²+2xy+y²÷x+2y/x²+xy