12×6÷12×648x99+1=6x648x(100-1)+1=3888x100-3888+1=388800-3887=384913
12x6÷12x648x99+1
=6x648x99+1
=6x648x（100-1）+1
=6x648x100-6x648+1
=388800-3887
=384913
12×6÷12×648×99+1
=12÷12×6×648×(100−1)+1
=1×6×648×(100−1)+1
=6×648×100−6×648+1
=600×(600+48)−6×(600+48)+1
=600×600+600×48−6×600−6×48+1
=360000+28800−3600−288+1
=388800−3600−287
=385200−287
=384913
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