(1)n,mA nmA,n+mB,n-mC (2)n,mBn+mnmA (3)AD,BD.

n2x^n1 (x1)^2 ...

N () N3 (H8-H14).

Understanding the Context

n n6768n5314.

2019^1815n15n^2+3n-115 !

N52N75N35.

m,nm73m+n71n7n-1mod7n-16mod7.

Key Insights

148n= 4245n= 5148n= 4144n= 245n= 5240n= 1442406...

IIBnn3253n1000nn3a+2,n=5b+3 a,b.

n2^n3 2^1=23.