Répondre :
1) soit a un nombre réel quelconque
( a + 1 )² -a² =a²+2a+1-a²
=2a+1
donc 24443113² - 24443112²
=2*24443112+1
=48886225
2) A(x)= ( x-2√ x+1)(x+2√ x+1)
=(x+1)²-4x
=x²+2x+1-4x
=x²-2x+1
= (x-1)²
donc A (101)=100²=10000
( a + 1 )² -a² =a²+2a+1-a²
=2a+1
donc 24443113² - 24443112²
=2*24443112+1
=48886225
2) A(x)= ( x-2√ x+1)(x+2√ x+1)
=(x+1)²-4x
=x²+2x+1-4x
=x²-2x+1
= (x-1)²
donc A (101)=100²=10000