1600-80b+b^2= (40-b)^2
1/8x^3-y^3=(1/8x-y) (x^2 +xy + y^2)
(-2y+0,3)(2y+0,3)=0,3^2-(2y)^2=0,09-2y^2
-25x^2+y^2=y^2-25x^2=(y-5x)(y+5x)
(x^2-2)(x^2+2)=x^4-4
4x^2+12x+9=(2x+3)^2
0,04a^6-b^4=(0,2a^3-b^2)(0,2a^3+b^2)
1600-80b+b^2= (40-b)^2
1/8x^3-y^3=(1/8x-y) (x^2 +xy + y^2)
(-2y+0,3)(2y+0,3)=0,3^2-(2y)^2=0,09-2y^2
-25x^2+y^2=y^2-25x^2=(y-5x)(y+5x)
(x^2-2)(x^2+2)=x^4-4
4x^2+12x+9=(2x+3)^2
0,04a^6-b^4=(0,2a^3-b^2)(0,2a^3+b^2)