(1-2²)+3²-4²+5²-6²+7²-8²+9²-10²
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/29 21:07:55
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(1-2²)+3²-4²+5²-6²+7²-8²+9²-10²
(1-2²)+3²-4²+5²-6²+7²-8²+9²-10²
(1-2²)+3²-4²+5²-6²+7²-8²+9²-10²
原式=-(2^2-1)-(4^2-3^2)-(6^2-5^2)-(8^2-7^2)-(10^2-9^2)
=-(2+1)(2-1)-(4+3)(4-3)-(6+5)(6-5)-(8+7)(8-7)-(10+9)(10-9)
=-3*1-7*1-11*1-15*1-19^1=-3-7-11-15-19=-55