若|x-(2的平方根)|+|y+1/(2的平方根)|=0,则(xy)2012次方为多少?
问题描述:
若|x-(2的平方根)|+|y+1/(2的平方根)|=0,则(xy)2012次方为多少?
答
∵ 丨x - √2丨+ 丨y + 1 / √2 丨= 0
∴ x - √2 = 0
y + 1 / √2 = 0
∴ x = √2 ,y = - 1 / √2 = - √2 / 2
∴ (x y)^ 2012 = (- √2 × √2 / 2)^ 2012 = (- 2 / 2)^ 2012 = 1