25x+y= 1200
Answer: x=48 y=47.
(2) 18x+23y=2303
74x-y= 1998
Answer: x=27 y=79
(3) 44x+90y=7796
44x+y=3476
Answer: x=79 y=48
⑷76x-66y = 4082
30x-y=2940
Answer: x=98 y=5 1.
(5) 67x+54y=8546
7 1x-y=5680
Answer: x=80 y=59
(6) 42x-95y=- 14 10
2 1x-y= 1575
Answer: x=75 y=48
(7) 47x-40y=853
34x-y=2006
Answer: x=59 y=48
(8) 19x-32y=- 1786
75x+y=4950
Answer: x=66 y=95
(9) 97x+24y=7202
58x-y=2900
Answer: x=50 y=98
( 10) 42x+85y=6362
63x-y= 1638
Answer: x=26 y=62
( 1 1)85x-92y =-25 18
27x-y=486
Answer: x= 18 y=44.
( 12) 79x+40y=24 19
56x-y= 1 176
Answer: x=2 1 y= 19.
( 13) 80x-87y=2 156
22x-y=880
Answer: x=40 y= 12.
( 14) 32x+62y=5 134
57x+y=2850
Answer: x=50 y=57
( 15) 83x-49y=82
59x+y=2 183
Answer: x=37 y=6 1.
( 16) 9 1x+70y=5845
95x-y=4275
Answer: x=45 y=25.
( 17) 29x+44y=528 1
88x-y=3608
Answer: x=4 1 y=93.
( 18) 25x-95y=-4355
40x-y=2000
Answer: x=50 y=59
( 19) 54x+68y=3284
78x+y= 1404
Answer: x= 18 y=34.
(20) 70x+ 13y=3520
52x+y=2 132
Answer: x=4 1 y=50.
(2 1) 48x-54y=-3 186
24x+y= 1080
Answer: x=45 y=99
(22) 36x+77y=76 19
47x-y=799
Answer: x= 17 y=9 1.
(23) 13x-42y=-27 17
3 1x-y= 1333
Answer: x=43 y=78
(24) 28x+28y=3332
52x-y=4628
Answer: x=89 y=30
(25) 62x-98y=-2564
46x-y=2024
Answer: x=44 y=54.
(26) 79x-76y=-4388
26x-y=832
Answer: x=32 y=9 1.
(27) 63x-40y=-82 1
42x-y=546
Answer: x= 13 y=4 1.
(28) 69x-96y=- 1209
42x+y=3822
Answer: x=9 1 y=78.
(29) 85x+67y=7338
1 1x+y=308
Answer: x=28 y=74
(30) 78x+74y= 12928
14x+y= 12 18
Answer: x=87 y=83.
(3 1) 39x+42y=533 1
59x-y=584 1
Answer: x=99 y=35
(32)29x+ 18y = 19 16
58x+y=2320
Answer: x=40 y=42
(33) 40x+3 1y=6043
45x-y=3555
Answer: x=79 y=93
(34) 47x+50y=8598
45x+y=3780
Answer: x=84 y=93
(35) 45x-30y=- 1455
29x-y=725
Answer: x=25 y=86
(36) 1 1x-43y =- 136 1
47x+y=799
Answer: x= 17 y=36.
(37) 33x+59y=3254
94x+y= 1034
Answer: x= 1 1 y=49.
(38) 89x-74y=-2735
68x+y= 1020
Answer: x= 15 y=55.
(39) 94x+7 1y=75 17
78x+y=3822
Answer: x=49 y=4 1.
(40) 28x-62y=-4934
46x+y=552
Answer: x= 12 y=85.
(4 1) 75x+43y=8472
17x-y= 1394
Answer: x=82 y=54.
4 1x-38y =- 1 180
29x+y= 1450
Answer: x=50 y=85
(43) 22x-59y=824
63x+y=4725
Answer: x=75 y= 14.
(44) 95x-56y=-40 1
90x+y= 1530
Answer: x= 17 y=36.
(45) 93x-52y=-852
29x+y=464
Answer: x= 16 y=45.
(46) 93x+ 12y=8823
54x+y=49 14
Answer: x=9 1 y=30.
(47) 2 1x-63y=84
20x+y= 1880
Answer: x=94 y=30
(48) 48x+93y=9756
38x-y=950
Answer: x=25 y=92
(49) 99x-67y=40 1 1
75x-y=5475
Answer: x=73 y=48
(50) 83x+64y=929 1
90x-y=3690
Answer: x=4 1 y=92.
(5 1) 17x+62y = 32 16
75x-y=7350
Answer: x=98 y=25.
(52) 77x+67y=2739
14x-y=364
Answer: x=26 y= 1 1.
(53) 20x-68y=-4596
14x-y=924
Answer: x=66 y=87
(54) 23x+87y=4 1 10
83x-y=5727
Answer: x=69 y=29.
(55) 22x-38y=804
86x+y=6708
Answer: x=78 y=24.
(56) 20x-45y=-3520
56x+y=728
Answer: x= 13 y=84.
(57) 46x+37y=7085
6 1x-y=4636
Answer: x=76 y=97.
(58) 17x+6 1y=4088
7 1x+y=5609
Answer: x=79 y=45
(59)5 1x-6 1y =- 1907
89x-y=23 14
Answer: x=26 y=53
69x-98y=-2404
2 1x+y= 1386
Answer: x=66 y=7 1.
(6 1) 15x-4 1y = 754
74x-y=6956
Answer: x=94 y= 16.
(62) 78x-55y=656
89x+y=55 18
Answer: x=62 y=76
(63) 29x+2 1y= 1633
3 1x-y=7 13
Answer: x=23 y=46
(64) 58x-28y=2724
35x+y=3080
Answer: x=88 y=85.
(65) 28x-63y=-2254
88x-y=2024
Answer: x=23 y=46
(66) 43x+50y=7064
85x+y=8330
Answer: x=98 y=57.
(67) 58x-77y= 1 170
38x-y=2280
Answer: x=60 y=30.
(68) 92x+83y= 1 1586
43x+y=30 10
Answer: x=70 y=62
(69) 99x+82y=6055
52x-y= 17 16
Answer: x=33 y=34
(70) 15x+26y= 1729
94x+y=8554
Answer: x=9 1 y= 14.
(7 1) 64x+32y=3552
56x-y=2296
Answer: x=4 1 y=29.
(72) 94x+66y= 10524
84x-y=78 12
Answer: x=93 y=27
(73) 65x-79y=-58 15
89x+y=23 14
Answer: x=26 y=95
(74) 96x+54y=62 16
63x-y= 1953
Answer: x=3 1 y=60.
(75) 60x-44y=-352
33x-y= 1452
Answer: x=44 y=68
(76) 79x-45y=5 10
14x-y=840
Answer: x=60 y=94
(77) 29x-35y=-2 18
59x-y=4897
Answer: x=83 y=75
(78) 33x-24y= 1905
30x+y=2670
Answer: x=89 y=43
(79)6 1x+94y = 1 1800
93x+y=5952
Answer: x=64 y=84.
(80) 6 1x+90y=500 1
48x+y=2448
Answer: x=5 1 y=2 1.
(8 1) 93x- 19y=2
86x-y= 1548
Answer: x= 18 y=88.
(82) 19x-96y=-59 10
30x-y=2340
Answer: x=78 y=77.
(83) 80x+74y=8088
96x-y=8640
Answer: x=90 y= 12.
(84) 53x-94y= 1946
45x+y=26 10
Answer: x=58 y= 12.
(85)93x+ 12y = 9 1 17
28x-y=2492
Answer: x=89 y=70
(86) 66x-7 1y=- 1673
99x-y=782 1
Answer: x=79 y=97
(87) 43x-52y=- 1742
76x+y= 1976
Answer: x=26 y=55
(88) 70x+35y=8295
40x+y=2920
Answer: x=73 y=9 1.
(89) 43x+82y=4757
1 1x+y=23 1
Answer: x=2 1 y=47.
(90) 12x- 19y=236
95x-y=7885
Answer: x=83 y=40
(9 1)5 1x+99y = 803 1
7 1x-y=29 1 1
Answer: x=4 1 y=60.
(92) 37x+74y=4403
69x-y=6003
Answer: x=87 y= 16.
(93) 46x+34y=4820
7 1x-y=5 183
Answer: x=73 y=43
(94) 47x+98y=586 1
55x-y=4565
Answer: x=83 y=20
(95) 30x- 17y=239
28x+y= 1064
Answer: x=38 y=53
(96)55x- 12y = 4 1 12
79x-y=7268
Answer: x=92 y=79
(97) 27x-24y=-450
67x-y=3886
Answer: x=58 y=84.
(98) 97x+23y=8 1 19
14x+y=966
Answer: x=69 y=62
(99) 84x+53y= 1 1275
70x+y=6790
Answer: x=97 y=59.
( 100) 5 1x-97y=297
19x-y= 1520
Answer: x=80 y=39
The seventh grade mathematics next semester simulated examination questions.
Proposer Wang Xiubin is the author: Xie Zhi becomes the examiner: Wang Xiubin.
Name: Class: Score:
The title is12345678 910/31415161718 65438.
answer
volume one
I. True or false questions (2 points for each question, 20 points for * * *)
1 and the equation x+y = 0 are binary linear equations.
2. In equation 4x-3y= 1, 3. When x= 1, 4, y = 1.
5. This solution is the solution of equation X-6Y+4 = 0.
6. X>3 is unary once not 7, and the equation X+1>; Solution set 4.
8. Know X>y, then-X.
9, number 10, equation 4x
1 1, X=2 is not 12, equation x+2.
The arithmetic square root of 13 is 0. 14.
The cube root of 14 and X3 is X. 。
10, a number has two square roots, which is reciprocal.
Second, multiple-choice questions (4 points for each small question, ***40 points)
1 1, which of the following equations is a binary linear equation ()
a、x-B 、= 1 B、xy=2 C、4x2-C、y=3 D、。
12, the solution of binary linear equations is-().
A.B. C. D。
13, the following equation, belongs to the binary linear equations is ().
A, B, C, D,
14. Among the following inequalities, it is ............................................ ().
A, B, C, D,
15. If the following categories are correct, it must be ...................................... ().
A, B, C, D,
16, known, then-
(a) is one of its solutions; (b) is its solution set.
(c) is its solution set; (d) is its solution set.
17. When blasting in a mountain-breaking project, it is known that the burning speed of the fuse is 0.5cm/s and the escape speed of people is 4 m/s. In order to make the blaster run safely to the safety zone beyond 100m, the inequality of the fuse length x(cm) should be ..................................................................
a、≥ 100 B、≤ 100 C 、< 100 D 、> 100
18, the following statement is correct: ....................................... ()
A rational number is only a finite decimal, and b irrational number is an infinite decimal.
C infinite decimal is irrational, and d is fraction.
19, the following correct conclusion is ...................................... ().
Any point on axis A represents a unique rational number, and any point on axis B represents a unique irrational number.
There is a one-to-one correspondence between the real number of C and the points on the number axis. The number represented by the right point on the D axis is not necessarily greater than that represented by the left point.
20, the following statement, the correct is ()
(1) The sum of irrational numbers and irrational numbers must still be irrational numbers. (b) There is no maximum rational number, but there is a minimum rational number.
(c) The product of irrational number and rational number must still be irrational number (d) If x2=64, then =2.
Volume II
Three, multiple-choice questions (3 points per question, ***36 points)
2 1, the number of solutions of binary linear equation 3a+b = 9 in the positive integer range is ().
a、0 B、 1 C、2 D、3
22. If the binary linear equation 3x-2y = 1 has a positive integer solution, then the value of x is ().
A, 0 B, even c, odd d, odd or even.
23, using substitution elimination method to solve equations, substitution elimination method, the correct is ().
Y=3x+2 starts from ①, and 3x = 1 1-2 (3x+2) is substituted into ②.
Substitute the value in ② into ②.
Replace one of ① with ②.
② 3x = 1 1-2y, ① 1 1-2y-y = 2.
24, the solution of the equation is ()
25. Party A and Party B start from two places which are s kilometers apart at the same time. If they drive in the same direction, the faster one will catch up with the slower one after t 1 hour. If they go in the opposite direction, and after t2 hours, they meet, then the speed of the fast is the speed of the slow ().
A times b times c times d times.
26. if 2x │ m │+(m+1) y = 3m-1is a binary linear equation about x and y, then the range of m is () a, m≦- 1 b, m m =1c.
27, known a, b two numbers on the number axis position as shown in the figure, let m = a+b, n =-a+b, h = a-b, then the following is correct ().
Morning > morning > afternoon; b . H > M > N；
C.h > M > N； D.M>H>N
28, known as (x+3) 2+= 0, y is negative, then the range of m is
More than 9 am, less than 9 pm, less than 9 pm
29, when 0
A.<x & ltx2 b < X2<X C. X & ltX2<X2 & lt； X & lt。
30, the following operation, the number of errors is ()
① ,② ,③ ,④
1 (B) 2 (C) 3 (D) 4。
The arithmetic square root of 3 1 is ()
Paragraph 1, paragraph 2, paragraph 3, item 4
32. If is a real number, and the value of is ().
(A) (B) (C) or (d)
Fill in the blanks (2 points for each question, ***8 points)
33, make up a binary linear equations have a solution is.
34. Logging with a rope, if the rope is 30% off, the rope is five feet more; If the rope is 40% off, the rope is one foot more. What is the geometric relationship between rope length and well depth? If the rope length is x feet and the well depth is y feet, the equation can be listed as follows
35. Use a matchstick to build a square according to the following method. If you build it this way, you need _ _ _ _ _ matches to build n such squares.
……
36. It is known that x = 3 is the solution of the equation-2 = x-1,then the inequality (2-) x 5-
38. When a is an integer value, the equation has a positive integer solution.
39. The contents of vitamins B and C in two foods and the costs of foods A and B are known as follows:
Jiayi
Vitamin B (unit/kg)
Vitamin C (unit/kg) 700 100
Cost (yuan/kg) 5 4
Now, two kinds of food are mixed into 100kg mixed food. Let the contents of food A and food B in the mixed food be x kg and y kg respectively. For example, mixed food requires no less than 40,000 units of vitamin B and no less than 28,000 units of vitamin C.
Find the value range of x;
What is the lowest cost of mixed food that meets the problem when Party A and Party B each take how many kilograms? And find the lowest cost price.
A company plans to produce a new type of motorcycle this year. The following information is provided by all localities:
⑴ Supply Department: Last year, the factory stocked 1 10,000 wheels, and the wheel workshop could produce10.5 million wheels on average every month, and each vehicle needs to be equipped with 2 wheels.
⑵ Production Department: The factory can load at least 1000 vehicles per month, but not more than 12000 vehicles.
⑶ Sales Office: The sales volume will be at least 13000 vehicles next year.
(3) The ex-factory unit price of this car is 1000 yuan/car.
If you are the prime minister of this factory, please determine the range of the total sales of this factory.
4 1 and binary linear equation ax+by=c are like a straight line in plane rectangular coordinates, so binary linear equation is also called linear equation. It is known that two solutions of the linear equation l 1: ax+by= 1 about x and y are sum linear equation l2:X+Y=3.
(1) find the equation of the straight line l 1.
⑵ Find the coordinates of the intersection of two straight lines.
(3) If the intersection of two straight lines is A, the straight line l 1 intersects the X axis in B, the straight line l2 intersects the X axis in C, and the moving point P starts from B and moves from B to C at a speed of 1 unit per second. When point P starts a few seconds later, the straight line AP bisects the area of △ABC as 1: 3.