100-98+96-94+92-90+…+8-6+4-2=_.
问题描述:
100-98+96-94+92-90+…+8-6+4-2=______.
答
100-98+96-94+92-90+…+8-6+4-2.
=(100-98)+(96-94)+(92-90)+…+(8-6)+(4-2),
=2×25,
=50;
故答案为:50.