其它
Find the value of the expression $100-98+96-94+92-90+\cdots +8-6+4-2$. 
Overseas Competition->Knowledge Point->Calculation Modules->Whole Numbers->Whole Numbers Addition and Subtraction ->Grouping in Fast Addition and Subtraction of Whole Numbers
$(100-98)+(96-94)+(92-90)+\cdots +(8-6)+(4-2)=2\times25=50$ 