Question

單項(xiàng)式的系數(shù)和次數(shù)分別為(    )

A．，3

B．，4

C．，3

D．，4

Answer 1

C

根據(jù)單項(xiàng)式系數(shù)、次數(shù)的定義來求解．單項(xiàng)式中數(shù)字因數(shù)叫做單項(xiàng)式的系數(shù)，所有字母的指數(shù)和叫做這個(gè)單項(xiàng)式的次數(shù).根據(jù)單項(xiàng)式系數(shù)、次數(shù)的定義可知，單項(xiàng)式-
的系數(shù)和次數(shù)分別為-1/2π，3．
故選C．
點(diǎn)評：確定單項(xiàng)式的系數(shù)和次數(shù)時(shí)，把一個(gè)單項(xiàng)式分解成數(shù)字因數(shù)和字母因式的積，是找準(zhǔn)單項(xiàng)式的系數(shù)和次數(shù)的關(guān)鍵．