两个数平方的和怎么求
发布网友
发布时间:2022-06-07 23:34
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热心网友
时间:2023-10-30 15:35
(996-975.5)^2+2×996×975.5
=20.5^2+2×996×975.5
=(20+0.5)^2+2×996×975.5
=20^2+0.5^2+2×20×0.5+2×996×975.5
=20^2+0.5^2+2×20×0.5+2×(1000-4)×(1000-24.5)
=20^2+0.5^2+2×20×0.5+2×(1000^2-28.5×1000+4×24.5)
=400+0.25+20+2×[1000×(1000-28.5)+98]
=400+0.25+20+2×1000×971.5+196
=400+0.25+20+1943000+196
=1943000.25+216+400
=1943616.25
好累
热心网友
时间:2023-10-30 15:36
用996*996+975.5*975.5