Question

Сделайте 1 и 3 пример плиииз​

Answer 1

1)

$(1.1x^2-6y)^2-(1.1x^2-6y)(1.1x^2+6y)=\\=(1.1x^2-6y)(1.1x^2-6y-(1.1x^2+6y))=\\=(1.1x^2-6y)(1.1x^2-6y-1.1x^2-6y)=\\=(1.1x^2-6y)(-12y)=\\=-12y(1.1x^2-6y)$

3)

$(3.1n^3-5m)^2+(5m-3.1n^3)(5m+3.1n^3)=\\=(3.1n^3-5m)(3.1n^3-5m-5m-3.1n^3)=\\=-10m(3.1n^3-5m)$

Answer 2

*(a+b)²=a²+2ab+b²

(a-b)²=a²-2ab+b²

a²-b²=(a-b)×(a+b)