问题
填空题
若x+y=1005,x-y=2,则代数式x2-y2的值是______.
答案
∵x+y=1005,x-y=2,
∴x2-y2
=(x+y)(x-y)
=1005×2
=2010.
故答案为:2010.
若x+y=1005,x-y=2,则代数式x2-y2的值是______.
∵x+y=1005,x-y=2,
∴x2-y2
=(x+y)(x-y)
=1005×2
=2010.
故答案为:2010.