The seventh grade mathematics book II chapter 8 power operation test questions 1, multiple-choice questions (2 points for each small question, ***50 points)
1. The following calculation is incorrect ()
A.30+2- 1= B. 10-4？ 10-2=0.0 1 C. 2n？ n= 2 D。
2. The following calculation is incorrect ()
A.m？ m= 0= 1 B. m？ (n？ p)= m-n-p
C.(-x) 5？ (-x) 4=-x D.9-3？ (3-3)2 = 1
3. The following calculation is correct ()
A.x8？ x4=x2 B. 8？ -8= 1 C.3 100？ 399=3 D.5 10？ 55? 5-2=53
4. 100m？ The calculation result of 1000n is ().
a . 100000m-n b . 102m-3n c . 100 Mn d . 1000 Mn
5. If =2, the value of x2+x-2 is ().
The fourth century BC.
6. in the equation m+n? The value of a in A= m-2 should be ()
A.m+n+2b n-2c m+n+3d n+2
7.2m+4 equals ()
A.2 m+2 B.( m) 2 4 C. 2？ m+4 D
8.xm+ 1 xm- 1？ The result of (xm) 2 is ()
A.-l b 1 c . 0d？ 1
9. The following equation is correct ()
①0.000 126= 1.26? 10-4 ②3. 10? 104=3 1 000
③ 1. 1? 10-5=0.000 0 1 1 ④ 12 600 000= 1.26? 106
A.①② B.②④ C.①②③ D.①③④
10.(- ? 103) 2? ( 1.5? The value of 104) 2 is ()
A.- 1.5? 10 1 1 b . 10 14 c .-4？ 10 14d .- 10 14
1 1. Among the following classifications, the correct one is ().
A.(2x-3)0 = 1 b . 0 = 0 c .(2- 1)0 = 1d .(m2+ 1)0 = 1
12. The result of calculation is ()
A.B. C. D。
13. If 26m >:2x & gt；; 23m, m is a positive integer, so the value of x is ().
A.4m B.3m C.3 D.2m
14. in the formula m+n? () = The formula in brackets in m-2 should be ().
A.m+n+2b n-2c m+n-2d n+2
15.(2? 3- 12? 2) 0 The result is ()
A.0b. 1C. 12D。 Meaningless.
16. The formula for 2 is ()
A.6? 3 B. 4 -2 C.( - 1) 2 D. 4- 2
17. The following calculation is correct ()
A.4 2 = 8 b . B3+B3 = B6 c . X5+x2 = x7 d . x x7 = x8
18. (-2 3) 2 equals ()
A.4 5 B.4 6 C.4 9 D.-4 6
19. The following operation is correct ()
a . X5 x = X5 b . X5-x2 = x3 c .(-y)2(-y)7 = y9d .-y3？ (-y) 7=y 10
20. The following operation is correct ()
A.x 10？ (x4？ x2)=x8 B.(xy) 6？ (xy) 2=(xy) 3=x3y3
C.xn+2？ xn+ 1=x-n D.x4n？ x2n x3n=x-n
2 1. 25m? 5 meters ()
A.5 B.20 C.5m D.20m
22.1nm = 0.00000001m, then 2.5 nm should be expressed as ().
A.2.5？ 10-8m B.2.5？ 10-9 m C.2.5？ 10- 10 m D.2.5？ 109 m
23. National Swimming Center? Water cube? It is one of the venues for the Beijing 2008 Olympic Games. Its outer membrane area is about 260,000 square meters, which should be expressed as () by scientific notation.
A.0.26？ 106 B.26？ 104 C.2.6？ 105 D.2.6？ 106
24. The following operation is correct ()
A.2 3 = 6 b .(-y2)3 = y6 c .(m2n)3 = m5n 3d .-2 x2+5 x2 = 3 x2
25. According to the latest data provided by the Ministry of Education, in 2008, the national general college entrance examination plan enrolled 6.67 million students. This data scientific notation is expressed as (the result is to retain two significant figures) ().
A.6.6？ 106 B.66？ 106 C.6.7？ 106 D.67？ 106
Fill in the blanks (2 points for each small question, ***44 points)
26.2? (- )2=____________.
27.(x2)-3？ (x3)- 1？ x=____________。
28.-b2？ (-b) 2 (-b3)=_____________。
29.(x-y) 2 (y-x) 3=______________。
30.0. 1252008? 82009=_____________.
3 1.-4n？ 8n- 1=_____________。
32.3 __________ m+ 1= 2m+4
33. Given 10 = 5, 10b = 25,103-b = _ _ _ _ _ _.
34. Given Axn+ 1=x2n+ 1, then A = _ _ _ _ _ _ _ _ _
35.0.258? 643? 258? 48=______________.
36.-52? (-5) 2? 5-4=_____________.
37.(2)2(b)3-(-2b)3(-)= _ _ _ _ _ _ _ _ _ _ _ _ _ _。
38.(- )6? (- )3=____________.
39.2 5? 6=____________.
40.50? 5-2+25- 1=____________.
4 1.m3？ (m2) 6？ m 10 = _ _ _ _ _ _ _ _ _ _ _ _。
42.-xm+ 1？ XM- 1 = _ _ _ _ _ _ _ _ _ _ _ _。
43.(m- 1) n？ Mn = _ _ _ _ _ _ _ _ _ _ _ _。
44. If 22n=4, then n = _ _ _ _ _ _ _
45. If 64? 83=2x, then x = _ _ _ _ _ _ _ _
46. If x3=(-2) 5? () -2, then x = _ _ _ _ _ _ _ _ _
47. Use scientific notation to express 0.000000125 = _ _ _ _ _ _.
Three. Calculation problem (4 points for each minor problem of 48 ~ 565438 +0, 5 points for each minor problem of 52 and 53, ***26 points)
48.(-3 3) 2? 2
49.xn+ 1？ xn- 1(xn) 2 (x？ 0)
50.x5 x4-x6？ x2？ x
5 1.( -3) 0+(- )3-( )-2
52.3x2？ xn-2+3(-x) 2？ xn-3？ (-x)
53.(-3? 3-2)-3-(-32) 2? 32? 20090
The answer to the eighth chapter of the seventh grade mathematics volume II is 1. C2 . B3 . C4 . b5 . B6 . D7 . b8 . B9 . c 10 . b 1 1 . d。
12.D 13。 A 14。 D 15。 D 16。 B 17。 D 18。 B 19。 D 20。 A 2 1。 C 22。 B 23。 C 24。 D 25。 C
26.4 27.28.b7 29。 (y-x) 5 30.8 3 1。 -23rd.-32nd. m
33.5 34.xn 35.4
36.- 1 37.0 38.- 3 39.40. 1.4 1.5 42。 -x2 43。 44. 1
45. 15 46.-2 47. 1.25? 10-7
48. Solution: (-3 3) 2? 2 =9 6? 2 =9 6-2=9 4
49. solution: xn+ 1? xn- 1？ (xn)2 = x(n+ 1)+(n- 1)-2n = x0 = 1
50. Solution: x5? x4-x6 x2 x=x9-x29=0。
5 1. solution:
52. Solution: The original formula =3xn-3xn=0.
53. Solution: (-3? 3-2)-3-(-32) 2? 32? 20090=-27-9? 1=-36