\(\left(10^2-10\right)=100-10=90⋮45=2\)
102 - 10
= 100 - 10
= 90
Mà 90 chia hết cho 45.
=> ( 102 - 10 ) chia hết cho 45
\(10^2\)\(-\)\(10\)
\(=\)\(100\)\(-\)\(10\)
\(=\)\(90\)
Mà: \(90\)\(⋮\)\(45\)
\(\Rightarrow\)\(\left(10^2-10\right)\)\(⋮\)\(45\)