Question

已知|4x-2y-3|+(x+2y-7)的二次方=0,则(x-y)的二次方=?

Answer 1

|4x-2y-3|+(x+2y-7)的二次方=0

|4x-2y-3|=0

(x+2y-7)^2=0

4x-2y-3=0

x+2y-7=0

5x=10

x=2

y=(7-x)/2=(7-2)/2=2.5

(x-y)^2=(2-2.5)^2=(-0.5)^2=0.25