问题
填空题
100-98+96-94+…+8-6+4-2.
答案
100-98+96-94+…+8-6+4-2,
=(100-98)+(96-94)+(92-90)+…+(8-6)+(4-2),
=2×25,
=50.
100-98+96-94+…+8-6+4-2.
100-98+96-94+…+8-6+4-2,
=(100-98)+(96-94)+(92-90)+…+(8-6)+(4-2),
=2×25,
=50.