题目内容
100-98+96-94+92-90+…+76-74+72=
100-98+96-94+92-90+…+76-74+72,
=(100-98)+(96-94)+(92-90)+…+(76-74)+72,
=2+2+2+2+2+2+2+72,
=14+72,
=86.
=(100-98)+(96-94)+(92-90)+…+(76-74)+72,
=2+2+2+2+2+2+2+72,
=14+72,
=86.
练习册系列答案
相关题目