《整式的乘法与因式分解》单元测试题
一、选择题
1.下列式子中,正确的是..............................( ) A.3x+5y=8xy
B.3y2-y2=3 C.15ab-15ab=0
D.29x3-28x3=x
2.当a=-1时,代数式(a+1)2+ a(a+3)的值等于…………………………( ) A.-4
B.4
C.-2
D.2
3.若n为正整数,a=-1时,的值为( )
A.1 B.-1 C.0 D.1或-1 4.计算-[-(-2a)2]3等于( )
A.8a5 B.64a6 C.-64a6 D.256a8 5. ?x?5??x?7?的计算结果是 ( )
A.x2?12x?35 B.x2?12x?35 C.x2?2x?35 D.x2?2x?35
6.下列计算正确的是( ) A (x+3)2=x2+9 B (a-b)2=a2-2ab-b2
C (m+2n)(m-2n)=m2-2n2 D (-2+a)2=4-4a+a2
22已知,则代数式m?n?7m?n?1?2mn的值是( ) 7.
A.8 B.7
C.6 8.计算[(-a)4]n·[-(-a5)]n的正确结果是( )
A.a9n B.a2n+9 C.-a9n D.-a2n+9
9.如果(x+q)与(x+q)的积中不含x项,则q是( A.4 B.5 C.-5 D.-p 10.下列计算中错误
..的是 ( ) A.x?x?1??x2?x B.??x??2?x???2x?x2 C.??x?2?x?3???x3?3x2
D.m?m2?n2??m3?mn2
二、填空题
11.因式分解:?m3n?6m2n2?9mn3?______. 12.若3m·3n=1,则m+n=_________.
D.5
). 13.若a2?3a?1?0,则a2?1? . a214.若多项式x2+ax+b分解因式的结果为(x+1)(x-2),则a+b的值为 .
15.9m?2?27m?1?3m?35,则m= .
16.如果a2?b2?14,ab??5,则a?b?____________.
三、解答题
17.把下列各式分解因式
(1)xy+ay-by (2)3x(a-b)-2y(b-a)
(3)m2-6m+9 (5) x4-1
(6) x2-7x+10
(4) 4x2-9y2