97×99×101×103 用乘法公式做
人气:329 ℃ 时间:2019-10-29 06:29:28
解答
97*99*101*103
=(97*103)*(99*101)
=(100^2-3^2)*(100^2-1)
=100000000-10000-90000+9
=99900009
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