The eighth grade mathematics chapter 16 "fraction" synchronous test questions 1 1. Simplification: _ _ _ _ _ _ _; 2. For the score, when x _ _ _ _ _ _ _ _ the score is meaningless; When x _ _ _ _ _ _ _ _ _ the value of the score is 0; 3. The simplest common denominator of a fraction is _ _ _ _ _ _ _ _ _ _ _; 4. Calculate _ _ _ _ _ _ _; _______________; 5. If yes, then d = _ _ _ _ _ _ _ _ _ _ _ _ _； If yes, then: = _ _ _ _ _ _; 6. The diameter of a particle is about 4280 nm, which is expressed by scientific notation as _ _ _ _ _ _ _ _ _ _ _ meters; 7. If it is known, then _ _ _ _ _ _ _ _; 8. If the two sums of fractions are opposite to each other, the listed equation is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _; 9. If the score is negative, the value range of X is _ _ _ _ _ _ _ _ _ _ _ _; 10. If it is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ If it is known (where A and B are constants), then A = _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _12. Both parties start from A and ride 20 kilometers to B at the same time. It is known that A drives 3 kilometers more than B, and as a result, A is better than B. If A is driving at the speed of X kilometers per hour, the equation can be listed as _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _; If it takes y hours for A to arrive at B, the equation can be listed as _ _ _ _ _ _ _ _ _ _ _ _. 13. The following scores:, among which () are the simplest scores. A. 4 B. 3 C. 2 D. 1 14。 If the x and y of the score are reduced by 12 times at the same time, then the value of the score () A. Enlarge 12 times B. Reduce 12 times C. Invariant D. Reduce 6 times 15. The calculation result is () A. X.B.C.D. 16. Without changing the value of the fraction, the coefficients of the numerator and denominator are converted into integers, and the result is () A.B.C.D. 17. The following statement is correct: (A. B. C. D. 18. If it is an integer, the value that makes the score an integer is () (A)2 (B)3 (C)4 (D)5 19. The value is () a.b.c.d.20. During the "May Day" Jiangbei Shuicheng Cultural Tourism Festival, several students chartered a car to travel. Van rental price 180 yuan, and two more students were added at the time of departure. As a result, each student spent less money and fares in 3 yuan than before. Suppose there are ***x students taking part in the tour, then the equation listed is () A.B.C.D.2 1. Define an operation in a positive range ☆ its rule is ☆ =, and according to this rule, the solution of ☆ is () A.B.C or1d. or (1) (2) (3) (4) (5) (6) 22. Solve the equation: (1) (2) 23. Simplify or evaluate: (1) If yes, simplify; (2) Find the given value. (3) If solving the fractional equation about x will increase the roots, find the value of m.. 24. Application: (1) Class 8 (1) and Class 8 (2) participated in the activities of greening the motherland and planting trees. It is known that class 8 (1) plants 2 more trees per hour than class 8 (2), and it takes the same time for class 8 (1) to plant 66 trees. (2) A person rides a bike 8 kilometers faster than walking, and rides a car 24 kilometers faster than walking. This person starts from place A, walks 4 kilometers first, and then takes a bus 10 kilometers to place B. It takes him the same time to go back and forth from B to A by bike. Find the walking speed of this person. (3) Read the following dialogue: Xiaohong's mother: "Salesman, please buy me some pears." Salesman: "Little Red Mom, all the pears you bought last time are sold out, and we haven't had time to buy them yet. I suggest you buy some new apples this time. The price is a little more expensive than pears, but apples have higher nutritional value. " Xiaohong's mother: "OK, you are very trustworthy. This time I will spend 30 yuan money like last time. " Comparing the two computer receipts before and after, Ma Hong found that the price of apples per kilogram was 1.5 times that of pears, and the weight of apples was 2.5 kilograms lighter than pears. According to the above conversation and Ma Xiaohong's discovery, find out the unit price of pear and apple respectively. The eighth grade mathematics synchronous test questions-Chapter 16 "Score" Answer: 1. 2.x=-3，x = 3； 3.； 4., ; 5., 19: 13 ; 6.4.280ⅹ ; 7. 1 1 ; 8.； 9.； 10.； 1 1.-0.5 2.5 ; 12., ; 13~2 1.DCCBC CDDB 22。 ① ; ② ; ③ ; ④ ; ⑤ ; ⑥ ; 23.① x = 1 (increasing root), so the original equation has no solution; ②x = 2 ^ 24。 ① 1; ②-3; ③-4 or 6; 25.① 20 strains of class (1) and 22 strains of class (2); ② The walking speed is 6 kilometers per hour; (3) The unit price of pears is 4 yuan/kg, and that of apples is 6 yuan/kg. Chapter 16 "Fractions" in Grade 8 Mathematics has a synchronous test 2 1. Given x≠y, the following formula is equal to () (a) (b) (c) (d) 2. The result of simplification is () (a) (b) (c) (d) 3. The result of simplification is () (a) x- 1 (b) 2x- 1. X+ 14。 The correct calculation result is () (a) (b) 1 (c) (d)- 15. The fractional equation () (a) has no solution (b) has a solution x= 1 (C) has a solution x= integer X, and the value of X is () (A)0 (B) 1 (C)0 or 1 (D)0 or-/kloc-0. A pool has two water inlet pipes. If it takes one hour and b hours to open the pipes respectively, the empty pool can be filled. Now two pipes are opened at the same time, and the time to fill the empty pool is () (a) (b) (c) (d) 8. It takes t hours for the car to travel from a to b. If it travels many kilometers per hour, the number of hours it can arrive in advance is () (a) (b) (c) (d) 9. The following statements: ① If a ≠ 0, m and n are arbitrary integers, then am. an = am+n； ② If A is a rational number, M and N are integers, and Mn >；; 0, then (am)n = AMN；; ③ If a≠b and ab≠0, then (a+b) 0 =1; ④ If a is a natural number, then a-3.a2 = a- 1. Among them, the correct one is (). (a) ① (b) ① ② (c) ② ③ ④ (d) ① ② ③ 10。 Teacher Zhang and Miss Li started from school at the same time and left 15km. Suppose Mr. Li walks X kilometers every hour. According to the meaning of the question, the equation is: () (a) (b) (c) (d) 1 1. Calculate 12. The solution of the equation is 13. Calculate a2b3(ab2). -2 =. 14. Balmer, a Swiss middle school teacher, successfully obtained Balmer formula from spectral data, which opened the door to the mystery of spectrum. Please write the seventh data according to this rule. If you remember =f(x) and f( 1) represents the value of y when x= 1. F () represents the value of y when x=, that is, f () =; ... then f (1)+f (2)+f ()+f (3)+f ()+...+f () = (the result is expressed by an algebraic expression containing n) 16. Simplify first, then evaluate:, where m = reevaluate: where x=-3 "Xiaoling mistakenly copied" x=-3 "as" x=3 "when doing the problem, but her calculation result is also correct. Please explain how this happened. 19. The distance between A and B is 80km. After cycling from A 1 hour, B also started from A, catching up with A 1.5 times the speed. When B arrived at B, A had already arrived for 20 minutes. Find the velocity of a and b 16.4. Test questions 1, 1. C2 B3 . a4 . a5 . D6 . C7 . D8 . a9 . b 10。 B 2 in this chapter,11.12.x = 3013.14.15.3, 16. -517.x =18 ...19. You can buy 100 pens or 450 diaries. 20. The speed of Party A is 40kg/h and that of Party B is 60kg/h (2) omitted. 59660.66666866666