解方程组：想x^2+y^2=10 Thank you x+xy+y=7
问题描述：
解方程组：想x^2+y^2=10 Thank you x+xy+y=7
答
(x+y)^2-2xy=102xy=(x+y)^2-10x+xy+y=72xy+2(x+y)-14=0(x+y)^2+2(x+y)-24=0(x+y+6)(x+y-4)=0x+y=-6或x+y=42xy=26 xy=13或2xy=6 xy=3x,y是方程z^2+6z+13=0或z^2-4z+3=0的两根.方程z^2+6z+13=0 判别式36-52...