77乘以77乘以1/76减1/76

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77乘以77乘以1/76减1/7677乘以77乘以1/76减1/7677乘以77乘以1/76减1/765928/76.77×77×1/76-1/76=77×(76+1)×1/76-1/76=(77×7

77乘以77乘以1/76减1/76
77乘以77乘以1/76减1/76

77乘以77乘以1/76减1/76
5928/76.

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