Final examination paper of sixth grade mathematics in Xinghualing District (with answers) (Jiangsu Education Edition)

2007 school year second semester sixth grade mathematics mid-term examination paper

(Examination time: 80 minutes)

I. Fill in the blanks (2 points for each question, ***36 points)

The ratio of (1) 560 km: 80 km is (), and the simplest ratio is ().

(2) If the ratio of number A to number B is 4∶5, number A is less than number B by ()%.

The reciprocal of (3) is itself. | x-2 | = 4 x is () or ().

(4) | x-2 |+(y-3) 2 = 0, then xy = ().

(5) If-12 xm+ 1 y4n and 3x4y 12 are similar terms, then m= () and n= ().

(6) The difference between the reciprocal of 6 13 minus the reciprocal of -3 is ().

(7) When n is a natural number, (-1) 2n+(-1) 2n+1= ().

(8)-4.5× 104 has () significant digits, and the original number is ().

(9) When a= 14 and b =-5, the value of algebraic expression 4b2a+3b is equal to ().

(10) single item 34 x 4y 3 is a () second single item, and its coefficient is ().

(1 1) When a number increases by 20%, it becomes 360, and this number is ().

(12) The original price of a dress was 120 yuan, and now it's 20% off, which is () yuan cheaper than the original price.

(13) Deposit RMB 2,500 in the bank for a fixed period of 3 years, with an annual interest rate of 2.25%, and the bank will pay RMB () at maturity.

(14) A project needs 10 days for Team A and 12 days for Team B. The work efficiency of Team A is ()% of that of Team B.

(15) Class 6 (1) There were 48 people yesterday, and 2 people were absent. The attendance rate yesterday was ().

A wire is 20 meters long. The first time you need12m, the second time you need12m, and there are () metres left.

(17) Cut the largest square on a circle with a radius of 4cm, and the area of this square is ().

(18) Circle a sector with an arc length of 12.56cm into a cone, and the bottom area of this cone is () cm2.

Second, multiple-choice questions (2 points for each question, ***8 points)

(19) It takes 8 minutes to saw the 2m-long material into 7 sections, with an average sawing time accounting for () of the total time.

a、 17 B、 16 C、 18 D、 14

(20) The approximate value of 78.945 rounding to three significant figures is about ().

a、78.9 B、79.0 C、78.945 D、79

(2 1) I read 40% of the whole book in one book, and the rest was 60 pages more than I read, and I read () pages.

a、 150 B、40 C、 120 D、300

(22) If both A and B are rational numbers, then the following statement is correct ().

A, if a≠b, then a2≠b2 B, if a >；; |b|, and then a2 & gtb2

c 、|a| >; |b|, then a>B D, if a2 & gtB2, then a>b.

Three. Calculation (4 points for each small question, ***28 points)

(23) degradation assessment: 5a2-[a2+(5a2-2a)-2(a2-3a)], where a=- 1 12.

(24)334 -5 13 + 156 (25)9.87-578 -0. 125

(26)(- 12 + 16 + 18 )×(-0.24) (27) 1735 ÷[7.8 + 58 ×(234 - 1. 15)]

(28) 4 12 ×[(- 23 )2-( 1- 13 )] - 13 ×[(-2)2 - 1]

(29) It is known that a =-a2+3b2 and b = 2a2-ab- 12b2 find the polynomial 2b-a..

Four, application problems (7 points per question, ***28 points)

(30) Export 500 motorcycles, each at 22,000 yuan, and pay taxes according to regulations 10%. In order to encourage exports, the tax is actually 20% of the taxable amount. How much do these motorcycles actually pay?

(3 1) A typist typed a manuscript, and typed 25% of the total on the first day, 25% of the total on the second day, and typed 6 pages more than the first day. How many pages are there in this manuscript?

(32) Xiaohua reads 20 pages of a book every day, and 40% of the book remains after 6 days. How many pages are there in this book?

(33) The department store bought 20 coats from each 240 yuan and sold them at a 40% increase. After selling 65,438+02 coats, the store sold the remaining coats at a discount due to the warmer weather. Is the store profitable or losing money after selling these coats? If so, how much did you earn?

References:

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