求导：X2+XY+Y2=4

求导：X2+XY+Y2=4 (x2+xy+y2)-4xy(x2+y2) x2+y2+2xy=256 x2+y2-2xy=4 (x2, 解方程组 x2+2xy+y2-4=0 x2-2xy+y2-1=0 分解因式(x2+xy+y2)2-4xy(x2+y2)=? (x2+xy+y2)-4xy(x2+y2)因式分解 (x2-2xy+y2)-(x2+2xy+y2)=什么 解方程组x2+xy=12 xy+y2=4 已知x2+4y2+x2y2+1=6xy,则(x4-y4)/(2x2+xy-y2)*(2x-y)/(xy-y2)/(x2+y2/y)2= x2-2xy+y2=4 x2+y2-x-y=6 解不等式x2-2xy+y2=4 x2+y2-x-y=6 解不等式 已知X2次方+XY=3,XY+Y2次方=-2,求下例值:X2次方+4XY+3Y2次方 x2-y2=xy,xy不等于0求x2/y2=y2/x2 若X2+xy-2y2=0,则（x2+3xy+y2)/x2+y2=? y=x2y+xy2+x2+y2+1对x求导=2xy+y2+2x对y求导=x2+2xy+2y（字母后母的2是平方）我想问的是对x求导,把y看成常数,常数的导数不是0吗?对x求导,为什么单独的y2就不变呢?还是y2? 已知x2+xy=4,xy+y2=12,求代数式x2-y2与x2+2xy+y2的值各为多少格式正确 已知x2+y2 =7,xy=-2.求5x2 -3xy-4y2 -11xy-7x2 +2y2 已知x2+y2=7,xy=-2,求5x2—3xy—4y2—11xy—7x2+2y2的值 若3x2-4xy+y2=-3,2x2+3xy-2y2=8,求5x2-18xy+7y2的值.