urgence dm de math our mardi je omprend rien

A(1)= 1-4+9-2. A(2)= 4-9+16-2
= 1+5-2. = 4+7-2
= 6-2. =11-2
= 4. = 9

A(3)= 9-16+25-2
= 9+9-2
= 18-2
= 16

A(4)= 16-25+36-2
= 16+11-2
= 27-2
= 25