12345*98765-12344*98766的解法
问题描述:
12345*98765-12344*98766的解法
1
答
12345*98765-12344*98766
=12345*98765-(12345-1)*(98765+1)
=12345*98765-12345*98765-12345+98765-1
=98765-12346
= 86419