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问题: 数学题

12345*12321-12344*12321+12345*42000-12344*42001

解答:

解:12345*12321-12344*12321+12345*42000-12344*42001
=12345*12321+12345*42000-12344*12321-12344*42001
=12345*(12321+42000)-12344*(12321+42001)
=12345*54321-12344*54322
=(12344+1)*(54322-1)-12344*54322
=12344*54322+54322-12344-1-12344*54322
=54322-12344-1
=41977