Question

已知有理数x,y,z满足：x-z-2的绝对值+3x-6y-7的平方+3y+3z-4=0,求x的3n次方

Answer 1

已知有理数x,y,z满足：x-z-2的绝对值+3x-6y-7的平方+3y+3z-4的平方=0,

x-z-2=0 x-z=2

3x-6y-7=0 x-2y=7/3

3y+3z-4=0 y+z=4/3

x=3

y=1/3

z=1

x的3n次方y的3n+1次方-z

=3^3n*1/3^3n+1-1

=(3*1/3)^3n*1/3-1

=1/3-1

=-2/3