а) (2x-5)^2=4x^2-20x+25
б)(3a+1/2b)^2=9a^2+(3a/b)+1/(4b^2)
в)(a+4b)(a-4b)=a^2-16b^2
г)(2x-1/2a^2)(2x+1/2a^2)=4x^2-(1/4a4)
а) (2x-5)^2=4x^2-20x+25
б)(3a+1/2b)^2=9a^2+(3a/b)+1/(4b^2)
в)(a+4b)(a-4b)=a^2-16b^2
г)(2x-1/2a^2)(2x+1/2a^2)=4x^2-(1/4a4)