Question

a=10 si b+c+d=54. Calculati a*b+a*c+a*d=

Answer 1

A(B + C + D) = 10 * 54 = 540

Answer 2

$a \cdot b+a \cdot c+ a\cdot d= \\\\ = a\cdot (b+c+d)= \\\\ =10 \cdot 54= \\\\ =\boxed{540}$