( 4+у)^2. (Z+6)^2. (5+k)^2 (-a-x)^2. Решите пж
(4+у)²=4²+2·4у+у²=16+8у+у². (z+6)²=z²+2z·6+6²=z²+12z+36. (5+k)²=5²+2·5k+k²=25+10k+k². (-a-x)²=(-a)²+2ax+x²=a²+2ax+x².