Помогите со 162 пожалуйста
1.(m+5)^2 -(m-5)^2 (m+5-m+5)(m+5+m-5)=20m --------------------------------------- 2.(x+y)^2 -(x-y)^2 (x+y-x+y)(x+y+x-y)=2y*2x=4xy ----------------------------------------- 3.(x-6)^2 -9x^2 (x-6-3x)(x-6+3x)=-(6+2x)(2x-6)
Formula (a+b)^2=a^2+2ab+b^2 (a-b)^2=a^2-2ab+b^2