а) (2+3х)^2=4+12x+9x^2
b) (a-5b)^2=a^2-10b+25b^2
c) (y+10)(y-10)=y^2-100
A)=(2+3X)(2+3X)=4+12x+6x+9x=4+27x
b)=y^2-100
c)=(a-5b)(a-5b)=a^2-10ab+25b^2
а) (2+3х)^2=4+12x+9x^2
b) (a-5b)^2=a^2-10b+25b^2
c) (y+10)(y-10)=y^2-100
A)=(2+3X)(2+3X)=4+12x+6x+9x=4+27x
b)=y^2-100
c)=(a-5b)(a-5b)=a^2-10ab+25b^2