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数学题211x555+445x789+555x789+211x445
要用简便方法的:211x555+445x789+555x789+211x445
人气:451 ℃ 时间:2020-10-02 03:18:41
解答
211x555+445x789+555x789+211x445
=(211+789)*555+(789+211)*455
=1000*555+1000*455
=1000*(555+455)
=1000*1000
=1000000
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