(0,3c-0,2d)(0,2d-0,3c ) преобразуйте в многочлен

Question

(0,3c-0,2d)(0,2d-0,3c ) преобразуйте в многочлен

Answer 1

(0.3c-0.2d)(0.2d-0.3c)= - (0.2d-0.3c)(0.2d-0.3c)= - (0.2d-0.3c)²=
= - (0.04d² - 0.12dc+0.09c²) = -0.04d²+0.12dc-0.09c²=0.12dc-0.04d²-0.09c²