Thu gọn đa thức: P(y) = -2y^3 + y + 11/7 y^3 + 3y^2 - 5 - 6y^2 + 9
Giải thích
P(y) = –2y3 + y + \(\frac{{11}}{7}\)y3 + 3y2 – 5 – 6y2 + 9
= (–2 + \(\frac{{11}}{7}\)) y3 + (3 – 6) y2 + y + 9
= \(\frac{{ - 3}}{7}{y^3} - 3{y^2} + y + 9\).
P(y) = –2y3 + y + \(\frac{{11}}{7}\)y3 + 3y2 – 5 – 6y2 + 9
= (–2 + \(\frac{{11}}{7}\)) y3 + (3 – 6) y2 + y + 9
= \(\frac{{ - 3}}{7}{y^3} - 3{y^2} + y + 9\).