77乘以77乘以1/76减1/76

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77乘以77乘以1/76减1/76

77×77×1/76-1/76
=77×(76+1)×1/76-1/76
=77×76×1/76+77×1×1/76-1/76
=77+1/76×(77-1)
=77+1
=78

你好

77×(77×1/76-1/76)
=77×1/76×(77-1)
=77×1/76×76
=77

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