Question

dacă a+b=15 și c×d=8 calculează a×c×d+b×c×d+c×(a+b)×d×(a+b).

Answer 1

a + b = 15   si  c × d = 8

a × c × d + b × c × d + c × ( a + b ) × d × ( a + b ) = 1 920

= c × d × ( a + b ) + ( a + b ) × ( c × d ) × ( a + b ) =

= 8 × 15 + 15 × 8 × 15 =

= ( 8 × 15 ) × ( 1 + 15 ) =

= 120 × 16 =

= 1 920

Answer 2

a×c×d+b×c×d+c×(a+b)×d×(a+b)=
=c×d(a+b)+(a+b)(c×d)=
=8×15+8×15×8=
=120+960=
=1080