Question

Решите  2(d-5)d-(d+1)^3

Answer 1

2*(d-5)*d-(d+1)^3=(2*d-10)*d-(d+1)^3=2*d^2-10*d-(d+1)^3=2*d^2-10*d-(d^3+3*d^2+3*d+1)=2*d^2-10*d-d^3-3*d^2-3*d-1=-d^2-10*d-d^3-3*d-1=-d^2-13*d-d^3-1.