Question

已知有理数x、y、z满足条件|x-z-3|+(2x-4y-7)^2+(3x+4y-13)^2=0,求x^3n、y^3n+

Answer 1

|x-z-3|+(2x-4y-7)^2+(3x+4y-13)^2=0

x-z-3=0(1)

2x-4y-7=0(2)

3x+4y-13=0(3)

(3)+(1)得：5x=20

x=4

则y=1/4

z=1

x^3z= 4^3=64 y^3z+1=(1/4)^4=1/256