计算:1-2²+3²-4²+5²-6²+...+99²-100²
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计算:1-2²+3²-4²+5²-6²+...+99²-100²
计算:1-2²+3²-4²+5²-6²+...+99²-100²
计算:1-2²+3²-4²+5²-6²+...+99²-100²
(1-2)(1+2)+(3-4)(3+4)+```+(99-100)(99+100)
=(-1)(1+2+3+4+```+99+100)
=-5050