12345*98765简便运算
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12345X98765
=12345X(100000-1235)
=1234500000 - 12345x1235
=1234500000-12345x(1000+200+30+5)
=1234500000-12345000-12345x200-12345x30-12345x5
=1234500000-12345000-2469000-370350-61725
= 1219253925
=12345X(100000-1235)
=1234500000 - 12345x1235
=1234500000-12345x(1000+200+30+5)
=1234500000-12345000-12345x200-12345x30-12345x5
=1234500000-12345000-2469000-370350-61725
= 1219253925
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