A:单项式 3xy25 的系数是3,次数是2
B:单项式﹣15ab的系数是15,次数是2
C:xy−12 是二次多项式
D:多项式4x2﹣3的常数项是3
数轴上点A表示的数是2,那么与点A相距5个单位长度的点表示的数是 ____ .
我国民族共有( )
(C)
Harry Potter and the Deathly Hallows
By J.K. Rowling, paperback (平装书), 784 pages.
Publisher (出版商): Arthur Levine Books (07/07/2009)
Reading level: Age 9~12
Price: $16.69
Deceptively Delici
By Jessica Seinfeld, hard cover (精装书), 204 pages.
Publisher: Collins (09/01/2007)
Reading level: Parents
Price: $12.83
Rich Dad, Poor Dad
By Robert T. Kiyosaki, paperback, 266 pages.
Publisher: Business Plus(01/01/2010)
Reading level: Age 20~25
Price: $5.59
The Road
By Cormac McCarthy, paperback, 304 pages.
Publisher: Vintage Books (09/11/2007)
Reading level: Adults
Price: $5.50
关于系统的概念,下列说法正确的是( )