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?