巧算:50-49+48-47+…+4-3+2-1

2024-12-21 02:25:42
推荐回答(4个)
回答1:

50-49+48-47+…+4-3+2-1=(50-49)+(48-47)+。。。。。+(4-3)+(2-1)=25

回答2:

每两个数加括号,每一个都是1,共25组,结果25

回答3:

50-49+48-47+…+4-3+2-1
=(50-49)+(48-47)+…+(4-3)+(2-1)
=1+1+……+1+1
=1×50÷2
=25

回答4:

50-49+48-47+…+4-3+2-1

=(50-49)+(48-47)+…+(4-3)+(2-1)
=25