Question

16．把多項(xiàng)式$\frac{1}{2}$x²y-$\frac{1}{3}$x³y²-2+6xy³按字母x降冪排列是-$\frac{1}{3}$x³y²+$\frac{1}{2}$x²y+6xy³-2．

Answer 1

分析 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$\frac{1}{2}$x²y-$\frac{1}{3}$x³y²-2+6xy³按字母x降冪排列為：-$\frac{1}{3}$x³y²+$\frac{1}{2}$x²y+6xy³-2．
故答案為：-$\frac{1}{3}$x³y²+$\frac{1}{2}$x²y+6xy³-2．

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)．