巧算12345x6789-12346x6788
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12345x6789-12346x6788
=（12346-1）x（6788+1）-12346x6788
=12346x(6788+1)-1x(6788+1)-12346x6788
=12346x6788+12346x1-1x6788-1x1-12346x6788
=12346x6788+12346-6788-1-12346x6788
=12346x6788-12346x6788+12346-6788-1
=12346-6788-1
=12346-(6788+1)
=12346-6789
=12346-(6800-11)
=12346-6800+11
=5546+11
=5557
=（12346-1）x（6788+1）-12346x6788
=12346x(6788+1)-1x(6788+1)-12346x6788
=12346x6788+12346x1-1x6788-1x1-12346x6788
=12346x6788+12346-6788-1-12346x6788
=12346x6788-12346x6788+12346-6788-1
=12346-6788-1
=12346-(6788+1)
=12346-6789
=12346-(6800-11)
=12346-6800+11
=5546+11
=5557
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