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78分之77乘77简便运算
人气:207 ℃ 时间:2020-02-23 05:48:53
解答
77/78 ×77
=77/78 ×(78-1)
=77/78 × 78 - 77/78 ×1
=77- 77/78
=76又 1/78
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