6.666....6×6.66....67
6.6....6(1998个6)×6.6...6(1996个6)7的简便运算的列式
参考答案:(2/3-0.00000....1(1998个))*(2/3+0.00000....1(1998个)
=2/3平方-0.00000....1(1998个)平方
=4/9-0.00......1(3996个)
=4/9-1/1000000..000
=399999.....8/9000...000(3996个)
6.6....6(1998个6)×6.6...6(1996个6)7的简便运算的列式
参考答案:(2/3-0.00000....1(1998个))*(2/3+0.00000....1(1998个)
=2/3平方-0.00000....1(1998个)平方
=4/9-0.00......1(3996个)
=4/9-1/1000000..000
=399999.....8/9000...000(3996个)