100-99 98-97 96-95.4-3 2-1怎么用简便方法计算

2024-12-15 16:56:50
推荐回答(1个)
回答1:

100-99+98-97+96-95...+4-3+2-1
=(100-99)+(98-97)+(96-95)+……+(4-3)+(2-1)
=1+1+1+……+1+1
=1×(100÷2)
=1×50
=50