Question

已知有理数x,y满足|x+y-5|+(x-y+3)的2次方=0,求x,y的值

Answer 1

|x+y-5|+(x-y+3)的2次方=0

因为|x+y-5|>=0 (x-y+3)的2次方>=0

则x+y-5=0

x-y+3=0

解得

x=1

y=4