so sánh 99^99-99^98 với 99^100-99^99
Giải thích
9999 – 9998 = 9998(9 – 1) = 9998.8
99100 – 9999 = 9998(92 – 9) = 9998.72
Vì 72 > 8 nên 9998.72 > 9998.8
Vậy 99100 – 9999 > 9999 – 9998
9999 – 9998 = 9998(9 – 1) = 9998.8
99100 – 9999 = 9998(92 – 9) = 9998.72
Vì 72 > 8 nên 9998.72 > 9998.8
Vậy 99100 – 9999 > 9999 – 9998