Question

多項(xiàng)式xy²-7xy+4x²y-5的二次項(xiàng)系數(shù)是________，該多項(xiàng)式是________次多項(xiàng)式．

Answer 1

-7    3
分析：根據(jù)多項(xiàng)式的定義得到多項(xiàng)式xy²-7xy+4x²y-5是3次三項(xiàng)式，它的二次項(xiàng)為-7xy．
解答：多項(xiàng)式xy²-7xy+4x²y-5是3次三項(xiàng)式，它的二次項(xiàng)為-7xy，其系數(shù)為-7．
故答案為-7；3．
點(diǎn)評(píng)：本題考查了多項(xiàng)式：幾個(gè)單項(xiàng)式的和叫多項(xiàng)式．多項(xiàng)式中每個(gè)單項(xiàng)式都是多項(xiàng)式的項(xiàng)，這些單項(xiàng)式的最高次數(shù)，就是這個(gè)多項(xiàng)式的次數(shù)． 也考查了單項(xiàng)式．