а) (-c-3)*(c+1)= -c^2 -3c + c - 3= -c^2 - 2c - 3
б) (11a-4)*(3-2a)= 33a - 22a - 12 + 8a= 19a - 12
в) (x-1)(x^3 + 2xt - 3t^2)= xx^3 + x2xt - x3t^2 - 1x^3 - 12xt + 1*3t^2= x^4 + 2x^2t - 3xt^2 - x^3 - 2xt + 3t^2= x^4 - x^3 + 2x^2t - 3xt^2 - 2xt + 3t^2
а) (-c-3)*(c+1)
= -c^2 -3c + c - 3
= -c^2 - 2c - 3
б) (11a-4)*(3-2a)
= 33a - 22a - 12 + 8a
= 19a - 12
в) (x-1)(x^3 + 2xt - 3t^2)
= xx^3 + x2xt - x3t^2 - 1x^3 - 12xt + 1*3t^2
= x^4 + 2x^2t - 3xt^2 - x^3 - 2xt + 3t^2
= x^4 - x^3 + 2x^2t - 3xt^2 - 2xt + 3t^2