计算:98+94+90+86+…+2-100-96-92-88-…-4.
问题描述:
计算:98+94+90+86+…+2-100-96-92-88-…-4.
答
98+94+90+86+…+2-100-96-92-88-…-4
=(98-100)+(94-96)+(90-92)+…+(6-8)+(2-4)
=-2×25
=-50