一、选择题
1.计算x2?y2(?xy3)2的结果是( ) A. x5y10 B. x4y8 C. ?x5y8 D.x6y12
112.(?x2y)3?(x2y)2?(?x2y)计算结果为( )
2435A. ?x6y3 B. 0 C. ?x6y3 D. ?x6y3
16123.(2.5?103)3?(?0.8?102)2 计算结果是( ) A. 6?1013 B. ?6?1013 C. 2?1013 D. 1014
14.计算2xy?(?x2y2z)?(?3x3y3)的结果是( )
2A. 3x6y6z B. ?3x6y6z C. 3x5y5z D. ?3x5y5z 5.计算?(a2b)3?2a2b?(?3a2b)2的结果为( ) A. ?17a6b3 B. ?18a6b3 C. 17a6b3 D. 18a6b3 6.x的m次方的5倍与x2的7倍的积为( ) A. 12x2m B. 35x2m C. 35xm?2 D. 12xm?2 7.(?2x3y4)3?(?x2yc)2等于( )
A. ?8x13y14c2 B. 8x13y14c2 C. ?8x36y24c2 D. 8x36y24c2 8.x3ym?1?xm?n?y2n?2?x9y9,则4m?3n?( )
A. 8 B. 9 C. 10 D.无法确定
29. 计算(?3x2)?(?x3m?yn)(?ym)的结果是( )
31111A. 3x4mymn B. ?x2m?2ym C. ?2x3m?2ym?n D. ?(x?y)5m?n
3310.下列计算错误的是( )
A.(a2)3?(?a3)2?a12 B.(?ab2)2?(?a2b3)?a4b7 C.(2xyn)?(?3xny)2?18x2n?1yn?2 D.(?xy2)(?yz2)(?zx2)??x3y3z3
二、填空题:
1.(ax2)(a2x)?___________. 2.(__________)(x2y)2??x5y3
3.(?3x3y)?(?x4)?(?y3)?__________.
14.?6a2b?(abc)2?_____________.
25.(?3a2b3)2?4(?a3b2)5?_____________. 6.15xny?2xn?1?yn?1?______________.
17.2m?(?2mn)?(?mn)3?_____________.
28.(1.2?103)(2.5?1011)(4?109)?_______________.
三、解答题 1.计算下列各题
331(1)4xy2?(?x2yz3) (2)(a3b2)(?2a3b3c)
873
123(3)3.2mn2(?0.125m2n3) (4)(?xyz)?x2y2?(?yz3)
235
12(5)5x?(ax)?(?2.25axy)?(1.2x2y2) (6)x2y?(?0.5xy)2?(?2x)3?xy3
35
7(7)(?5xy)?3x2y?12x3?(?y2) (8)5a3b?(?3b)2?(?6ab)2?(?ab)?ab3?(?4a)2
4
1112、已知:x?4,y??,求代数式xy2?14(xy)2?x5的值.
874
3、已知:39m?27m?36,求m.