作业帮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乘以77乘以1/76减1/76
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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