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74乘以36怎么简便运算
人气:295 ℃ 时间:2020-04-26 06:37:00
解答
74*36
=(55+19)*(55-19)
=55^2-19^2
=3025-361
=2664

74*36
=74*(40-4)
=2960-296
=2960-300+4
=2664
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