1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101
1个回答
原式
=1+5+9+13.+201
=(201+1)x21÷2
=5151
相关问题
1/(2X3)+1/(3X4)+1/(4X5)+1/(5X6)+...+1/(100X101)=?
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