Question

若根号x减一加括号3x加y减一的平方等于零求根号5x加y的值

Answer 1

√(X-1)+(3X-Y)^2=0,得方程组：
{X-1=0
{3X-Y=0,
解得：X=1,Y=3,
∴√(5X+Y)
=√8
=2√2.