Question

(a + 1) (a - 1), если a = 1 2/3; a = 0; a = - 2,5

Answer 1

12/3+1)(12/3-1)=(4+1)(4-1)=5*3=15

(0+1)(0-1)=1*(-1)=-1

(-2.5+1)(-2.5-1)=-1.5*(-3.5)=5.25