Question

1-(у-2)^3= по формуле сокр умножения

Answer 1

a^3 -b^3 =(a -b)(a² +ab +b²)

1 -(y -2)^3 =(1 -(y-2))(1 +(y-2) +(y-2)²) =(1-y+2)(1+y-2+y²-4y +4) =(3 -y)(3 -3y +y²)