3x-64= 1 1

12+8x=52

0.8x-4.2=2.2

2x+5= 10

3x- 15=75

4x+4o=320

3x+77= 122

5x- 1.6=0.6

6x-4=20

10x-0.6=2.4

500- 12x= 140

1) 66x+ 17y=3967

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.

3X+ 18=52 x=34/3

4Y+ 1 1 = 22y = 1 1/4

3X 9 = 5 x = 5/27

8Z/6=48 z=36

3X+7=59 x=52/3

4Y-69=8 1 y=75/4

8X*6=5 x=5/48

7Z/9=4 y=63/7

15X+8-5X=54 x=4.6

5Y*5=27 y=27/40

8x+2= 10 x= 1

x*8=88 x= 1 1

y-90= 1 y=9 1

2x-98=2 x=50

6x*6= 12 x= 1/3

5-6=5x x=- 1/5

6*x=42 x=7

55-y=33 y=22

1 1 * 3x = 60x = 20/ 1 1

8-y=2 y=-6

1.x+2=3

2.x+32=33

3.x+6= 18

4.4+x=47

5. 19-x=8

6.98-x= 13

7.66-x= 10

8.5x= 10

9.3 times =27

10.7x=7

1 1.8x=8

12.9x=9

13. 10x= 100

14.66x=660

15.7x=49

16.2x=4

17.3x=9

18.4x= 16

19.5x=25

20.6 times =36

2 1.8x=64

22.9x=8 1

23. 10x= 100

24. 1 1x = 12 1

25. 12x= 144

26. 13x= 169

27. 14x= 196

28. 15x=225

29. 16x=256

30. 17x=289

3 1. 18x=324

32. 19x=36 1

33.20x=400

3 1.2 1x=44 1

32.22x=484

33. 1 1 1x = 1232 1

34. 1 1 1 1x = 123432 1

35. 1 1 1 1 1x = 12345432 1

36. 1 1 1 1 1 1x = 1234565432 1

37.46/x=23

38.64/x=8

39.99/x= 1 1

40. 1235467564x=0

4 1.2x+ 1= -2+x

42.4x-3(20 times) =3

43..-2(x- 1)=4

44.3X+ 189=52 1

45.4Y+ 1 19=22 5

46.3X+77=59

47.4Y-6985=8 1

48.X=0. 1

49.5 times =55.5

50.Y=50-85

(-8)-(- 1) =-7

45+(-30) = 15

- 1.5-(- 1 1.5) = 10

-0.25-(-0.5) =0.25

15- 1-(-20-4) =- 10

-40-28-(- 19)+(-24) =-73

22.54+(-4.4)+(- 12.54)+4.4 = 10

(2/3{ only two "/"are fractional lines}-1/2)-(1/3-5/6) = 2/3.

2.4-(-3/5)+(-3. 1)+4/5 =0.7

(-6/ 13)+(-7/ 13)-(-2) = 1

3/4-(- 1 1/6)+(-7/3) = 1/4

1 1+(-22)-3×(- 1 1) =22

(-0. 1)÷0.5×(- 100) =20

The cubic of (-2) -9 =- 17

23÷[-9-(-4)] =-23/5

(3/4-7/8)÷(-7/8) = 1/7

(-60)×(3/4+5/6)=-95

There is an electronic newspaper clock on the bell tower of the railway station. On the boundary of the clock face, a lantern is installed at the scale of every minute. At 9: 35: 20 in the evening, the angle between the hour hand and the minute hand is A. Ask how many lanterns are installed in the angle A.

A pool contains 84 tons of water, and there are two water pipes, A and B. The first water pipe drains 2.5 tons per hour, and the second water pipe drains 3.5 tons per hour. If the first pipe is opened and the second pipe is opened after 2 hours and 24 minutes, how many hours can the water in the pool be discharged after the first pipe is opened?

2. The correspondent sent a letter from A to B, and immediately returned to A. * * * It took 3 hours and 52 minutes, with a speed of 30 km/h when he left and 28 km/h when he came back, to find the distance between A and B.

3.A walks 5 kilometers every hour, and after 2 hours, B rides a bike to chase A. ..

(1) If the speed of B is 20km/h, how long will it take for B to catch up with A?

(2) If B is required to go 14km to catch up with A, what is the speed of B?

4. Party A and Party B practice race walking on the 400-meter circular runway. Party B walks 80 meters per minute, and Party A's speed is 1 and1/4 (1/4). Now Party A is in front of Party B 100 meters. How many minutes did they meet for the first time?

1. has a three-digit number, and its unit is three times smaller than the number on the 100th place, and the number on the unit is 1. If you exchange the number in the tenth place and the number in the hundredth place of this three-digit number to get a new number, then the original three-digit number is 270 times smaller than the new number and the original three-digit number is found.

The school has a four-story teaching building with six classrooms on each floor and three doors (two front doors and one side door of the same size) entering and leaving the building. The door was inspected during the safety inspection; When a main entrance and a side door are opened at the same time, 400 students can pass through in 2 minutes. If the main entrance has an average of 40 more students per minute than the side entrance.

(1) How many students can pass through a main entrance and a side door every minute on average?

(2) During the inspection, it was found that the efficiency of going out was reduced by 20% because students were too crowded in an emergency. According to the safety regulations, in case of emergency, students in the whole building should be evacuated safely through these three doors within 5 minutes. Suppose that each classroom in this teaching building has a maximum of 45 students. Q: Do these three doors meet the safety requirements? Why?

4. Party A and Party B walk from City A to City B. Party A walks 4 kilometers per hour, while Party B rides 8 kilometers per hour more than Party A. After half an hour, Party B sets out and both of them arrive at City B at the same time to find the distance between the two cities.

5. Several students in Education Middle School asked for cancellation. If there are 4 people living in each dormitory, there are 20 people left; If there are 8 people living in each dormitory, one dormitory is not empty and the others are full. Q: How many dormitories are there in this middle school? How many students are required to live on campus?