Question

(c+d)×(c-d) При c=2,d=½

Answer 1

(c+d)*(c-d)=c^2-d^2=4-1/4= 3 3/4

Answer 2

( с + d)( c - d ) = c^2 - d^2
c = 2 ; d = 1/2 ; c^2 = 4 ; d^2 = 1/4 = 0,25
4 - 0,25 = 3,75
Ответ 3,75