(9х+4у)²=81х²+72ху+16у²
(4-0,3а)²=16-2,4а+0,09а²
(9х+4y)^2 =81x^2 + 72xy + 16^2
(4-0,3a)^2= 16- 2,4a +0,09a^2
(9х+4у)²=81х²+72ху+16у²
(4-0,3а)²=16-2,4а+0,09а²
(9х+4y)^2 =81x^2 + 72xy + 16^2
(4-0,3a)^2= 16- 2,4a +0,09a^2