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)
0,3*4=1.4
1,4+0.8=2
2-7=-5
хз так или нет
решение во вложении.....................................................................................................................................................................................................................................................