Question

如果單項(xiàng)式3xy^m-2與-2x^n-1y³的和仍是單項(xiàng)式，那么m=________，n=________．

Answer 1

5    2
分析：根據(jù)題意知3xy^m-2與-2x^n-1y³是同類項(xiàng)，則1=n-1，m-2=3，所以易求m、n的值．
解答：∵單項(xiàng)式3xy^m-2與-2x^n-1y³的和仍是單項(xiàng)式，
∴1=n-1，m-2=3，
解得，n=2，m=5．
故答案是5，2．
點(diǎn)評：本題考查了合并同類項(xiàng)．根據(jù)題意知”3xy^m-2與-2x^n-1y³是同類項(xiàng)“是解題的關(guān)鍵．