Tính: a) (– 4x^3 – 13x^2 + 2x^5) + (13x^2 + 2x^3 – 12x – 1);
Giải thích
a) (– 4x3 – 13x2 + 2x5) + (13x2 + 2x3 – 12x – 1)
= – 4x3 – 13x2 + 2x5 + 13x2 + 2x3 – 12x – 1
= 2x5 + (– 4x3 + 2x3) + (– 13x2 + 13x2) – 12x – 1
= 2x5 – 2x3 – 12x – 1.
a) (– 4x3 – 13x2 + 2x5) + (13x2 + 2x3 – 12x – 1)
= – 4x3 – 13x2 + 2x5 + 13x2 + 2x3 – 12x – 1
= 2x5 + (– 4x3 + 2x3) + (– 13x2 + 13x2) – 12x – 1
= 2x5 – 2x3 – 12x – 1.