DAU COROANA!Urgent
Calculati folosind formulele de calcul prescurtat:
a) (x-1)la a doua+(x+1)la a doua=
b) (x-2)la a doua+(x+2)la a doua=
c) (x-3)la a doua+(x+3)la a doua=
d) (x-4)la a doua+(x+4)la a doua=
e) (x-5)la a doua+(x+5)la a doua=
f) (x-6)la a doua+(x+6)la a doua=
explicati-mi si cum ati facut,va rog