Question

17．單項(xiàng)式-$\frac{3{a}^{2}^{5}}{7}$的系數(shù)是-$\frac{3}{7}$；多項(xiàng)式1.2m³-m²n²+4mn+1的次數(shù)是4．

Answer 1

分析 根據(jù)單項(xiàng)式系數(shù)的定義和多項(xiàng)式的次數(shù)來(lái)求解．單項(xiàng)式中數(shù)字因數(shù)叫做單項(xiàng)式的系數(shù)；多項(xiàng)式的次數(shù)是多項(xiàng)式中最高次項(xiàng)的次數(shù)．

解答 解：?jiǎn)雾?xiàng)式-$\frac{3{a}^{2}^{5}}{7}$的系數(shù)是-$\frac{3}{7}$；多項(xiàng)式1.2m³-m²n²+4mn+1的次數(shù)是4．
故答案為：-$\frac{3}{7}$； 4．

點(diǎn)評(píng) 本題主要考查了多項(xiàng)式的次數(shù)的定義．解決本題的關(guān)鍵是熟記多項(xiàng)式中未知數(shù)的次數(shù)總和的最大值即為多項(xiàng)式的次數(shù)．