Theo bài ra , ta có :
100 . 100 = 1002
99 . 101 = (99+1) . (101-1) < 100 . 100 = 1002
Vậy 100.100 > 99.101
Ta có:100.100=10000
99.101=9999
Vì 10000>9999 => 100.100>99.101
ta có : 100 x 100 = 10000
99 x 101 = 9999
vì 10000 > 9999 nên 100 x 100 > 99 x 101
ta thay
100x100=100x(99+1)=100x99+100
99x101=99x(100+1)=100x99+99
vì 100>99 nên 100x100 > 99x101