Question

14．將多項(xiàng)式3xy³-x³-6-$\frac{4}{5}$x²y按字母x降冪排列$-{x}^{3}-\frac{4}{5}{x}^{2}y+3x{y}^{3}-6$．

Answer 1

分析 按照x的次數(shù)由高到低把多項(xiàng)式進(jìn)行排列．

解答 解：多項(xiàng)式3xy³-x³-6-$\frac{4}{5}$x²y按字母x降冪排列為$-{x}^{3}-\frac{4}{5}{x}^{2}y+3x{y}^{3}-6$．
故答案為：$-{x}^{3}-\frac{4}{5}{x}^{2}y+3x{y}^{3}-6$．

點(diǎn)評(píng) 本題考查了多項(xiàng)式：幾個(gè)單項(xiàng)式的和叫做多項(xiàng)式，每個(gè)單項(xiàng)式叫做多項(xiàng)式的項(xiàng)，其中不含字母的項(xiàng)叫做常數(shù)項(xiàng)．多項(xiàng)式中次數(shù)最高的項(xiàng)的次數(shù)叫做多項(xiàng)式的次數(shù)．