Выполните умножение (1+x)(1-x)= (a-2)(3-a)= (x-y)(x+y)= (a-b)(a-b)= (2a+b)(a+2b)= (3x+2y)(3x+2y)=

1) (1+х)(1-х)=1-х^2
2) (а-2)(3-а)= 3а-а^2-6+2а=5а-а^2-6
3)(х-у)(х+у)=х^2-y^2
4)(a-b)(a-b)=(a-b)^2=a^2-2ab+b^2
5) ...=2a^2+4ab+ab+2b^2=2a^2+5ab+2b^2
6)...=(3x+2y)^2=9x^2+12xy+4y^2