请问99乘99的简便运算方法?

2024-12-15 11:21:26
推荐回答(1个)
回答1:

99 X 99
= 99" - 1" + 1"
= ( 99 - 1 )( 99 + 1 ) + 1
= 98 X 100 + 1
= 9801