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(5又1/4)²-(3又3/4)²简便方法计算
199²+1+2x199
人气:305 ℃ 时间:2020-02-03 06:39:20
解答
(5又1/4)²-(3又3/4)²
=(5又1/4+3又3/4)(5又1/4-3又3/4)
=9 *3/2
=27/2
199²+1+2x199
=(199+1)²
=200²
=40000
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