简便运算:1900+1901……+1949=

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简便运算:1900+1901……+1949=
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简便运算:1900+1901……+1949=
简便运算:1900+1901……+1949=

简便运算:1900+1901……+1949=
明白了吗

1900+1901……+1949
=1900x50+1+2+...+49
=95000+(1+49)x49/2
=95000+25x49
=95000+25x50-25
=95000+1250-25
=95000+1225
=96225