《整式的乘除》基础测试

《整式的乘除》基础测试

(一)填空题(每小题2分，共计20分)

1. ______________________ x10=(-X3) 2= X12*x()【答案】x4;

2.

2. __________________________________ 4 ( m-n) 3*( n- m) 2= .【答案】4 (m-n).

3. ________________________________ —x2•( —x) 3•(—x) 2= .［答案】x7.

4. (2a—b) ()= b2—4a2.【答案】—2a—b.

5. __________________________________ (a—b) 2=( a+ b) 2+ .【答案】—4ab.

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6 (― ) 2+ 0= _____________ ; 4101x 0.2599= ___________ .【答案】10；16.

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2 1 2 2 5

7. 20 X19 =( ________________ ) ( )= .【答案】20+ , 20 — , 399 .

3 3 3 3 9

8. _________________________________________ 用科学记数法表示—0.0000308 = .

【答案】—3. 08x 10—5.

9. (x—2y+ 1) ( x—2y—1) 2=( ____ ) 2—( ) 2= .

【答案】x—2y, 1x2—4xy+ 4y.

10. _______________________________________________若(x+ 5) ( x—7) = x2+ mx + n,贝V m= _______________________________________________, n= _________ .【答案】一2,

35.

(二)选择题(每小题2分，共计16分)

11. .......................................................................................................................................... 下列计算中正确的是........................................................................... ( )

(A)a n a2= a2n( B) (a3) 2= a5(C) x4x3x= x7( D) a2n—3十a3—n= a3n —6

【答案】D.

12. .......................................................................................................................................... x2m+1可写作................................................................................. ( )

(A) (x2) m+1( B) (x m)才1( C) xx2m( D) (x m) m+1【答案】C.

13. ................................................................................................................... 下列运算正确的是( .......................................................................... )

(A)(—2ab) •(—3ab) 3=—54a4b4

(B)5x2•( 3x3) 2= 15x12

(C) (—0. 16) •(—10b2) 3=—b7

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(D)(2 x 10n) (― x 10n)= 102n【答案】D .

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14. .......................................................................................................................................... 化简

(a n b m) n,结果正确的是.................................................................. ()

(A) a2n b mn(B) a n2b mn(C) a n2b mn( D) a2n b m

【答案】C.

15. ............................................................................................................................. 若a z b，下列各式中不能成立的是............................................................... ( )

(A) (a + b) 2=(—a—b) 2(B) (a+ b) (a—b) = ( b+ a) ( b—a)

(C) (a —b) 2n=( b—a) 2n(D) (a—b) 3=( b—a) 3

【答案】B.

16. .......................................................................................................................................... 下列各组数中，互为相反数的是................................................................. ( )

(A) (—2) —3与23(B) (—2) —2与2—2

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