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.

98+94+90+86+…+2-100-96-92-88-…-4
=(98-100)+(94-96)+(90-92)+…+(6-8)+(2-4)
=-2×25
=-50