已知 2(【根号x】+【根号y-1】+【根号z-2】)=x+y+z,求x,y,z的值
问题描述:
已知 2(【根号x】+【根号y-1】+【根号z-2】)=x+y+z,求x,y,z的值
x 1 ,y 2 ,z 3.
答
x+y+z=(√x)^2+(√y-1)^2+1+(√(z-2))^2+2∴2[√x +√(y-1)+√(z-2)]==(√x)^2+(√y-1)^2+1+(√(z-2))^2+2=(√x)^2+1+(√y-1)^2+1+(√(z-2))^2+1∴(√x)^2+1+(√y-1)^2+1+(√(z-2))^2+1-2√x -2√(y-1)-2√(z-2)=0(...