用简便方法计算;1+2-3+4-5···+98-99+100

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2024-12-02 10:07:03
推荐回答(2个)
回答1:

(1+100)*50=5050

回答2:

=1+2+(4-3)+(6-5)+...+(100-99)
=3+1+1+1+...+1
=3+1*98/2
=3+49
=52