一共四题解方程组!
问题描述：
一共四题解方程组!
1.x-y=1,x2+xy+y2=1
2.x2+y2=6x,x+2y=0
3.x2-y2=3,x2-2xy+y2=1
4.4x2+4xy+y2=9,x2+5xy-6y2=0
答
1.x=y+1x²-2xy+y²+3xy=1,(x-y)²+3xy=1,1+3y(y+1)=1,xy=0y(y+1)=0,y1=0,y2=-1,x1=1,x2=0x1=1,y1=0; x2=0,y2=12.x+2y=0,x=-2yx²+y²=6x,4y²+y²=-12y,5y²+12y=0,y(5y+12)=0y1=0...