(2²+4²+6²+8²+10²)-(1²+3²+5²+7²+9²)
=(2²-1²)+(4²-3²)+(6²-5²)+(8²-7²)+(10²-9²)
=(2+1)(2-1)+(4+3)(4-3)+(6+5)(6-5)+(8+7)(8-7)+(10+9)(10-9)
=3+7+11+15+19
=55
(2²+4²+6²+8²+10²)-(1²+3²+5²+7²+9²)
(2²+4²+6²+8²+10²)-(1²+3²+5²+7²+9²)
数学人气:228 ℃时间:2020-03-23 14:47:07
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