Solve the system of inequalities 3x-1 ＞ 5. ① 2 (x + 2) ＜ x + 7 ②

Solve the system of inequalities 3x-1 ＞ 5. ① 2 (x + 2) ＜ x + 7 ②

Solve inequality 1 and get x > 2
Solve inequality 2 and get x < 3
The solution of inequality system is 2 < x < 3
Two
Solving the system of inequalities X-1 / 22 (x-1)
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x-1/22(x-1)
7-3x-2＞4x-4;
7x＜9;
x＜9/7;
∴x＜9/7;
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Solving system of inequalities-7
Resolvent-7
-51/6
Solving inequality-7 ≤ 2 (1-3x) / 5 ≤ 9
－35≤2(1－3x)≤45
－45≤2(3x－1)≤35
－45≤6x－2≤35
－42≤6x≤37
－7≤x≤37/6
Find the inequality 3x + 14 > 4 (2x-9); 2 (2x + 3)
3x+14>4(2x-9) x
1. Given 3x-6y-5 = 0, find the value of 2x-4y + 6
2. The store will increase the purchase price of a certain super VCD by 35%, and then put out the advertisement of "10% discount, 50 yuan taxi fee for delivery". As a result, each super VCD still makes a profit of 208 yuan, so how much is the purchase price of each super VCD?
3. Given A-B = - 3, C + D = 2, then the value of (B + C) - (A-D) is ()
4. A and B practice running. A runs 7 meters per second, B runs 6.5 meters per second, and a lets B run 5 meters first___
A.7x=6.5x+5 B.7x+5=6.5x C.(7-6.5)x=5 D.6.5x=7x-5
5. A supermarket launched the following preferential scheme:
(1) No discount for one-time shopping less than 100 yuan
(2) 10% discount for one-time shopping more than 100 yuan but less than 300 yuan
(3) One time shopping more than 300 yuan will be 20% off
Wang Ming paid 80 yuan and 252 yuan respectively for his two purchases. If Wang Ming bought the same goods at one time, he should pay___
A. 288 yuan b.322 yuan c.288 yuan or 316 yuan d.322 yuan or 363 yuan
6. Xiaoming is walking on the road at a speed of 6km per hour. A 20m long car comes from behind Xiaoming and passes by him. The time of passing Xiaoming is 1.5 s, so the speed of the car is____
1.∵3x-6y-5=0
　∴3x-6y=5
　　x-2y=5/3
　∴2x-4y+6
　　=2(x-2y)+6
　　=2×5/3+6
　　=28/3
2. Suppose the purchase price of each super VCD is a yuan
　　(1+35%)a×0.9-50=a+208
　　0.215a=258
　∴a=1200
A: the purchase price of each super VCD is 1200 yuan
[direct formula: (208 + 50) / [(1 + 35%) × 0.9-1] = 1200 yuan]
Three point five
　∵a-b=-3
　∴b-a=3
　∴(b+c)-(a-d)
　　=b+c-a+d
　　=(b-a)+(c+d)
　　=3+2
　　=5
4.B
5.C
The original price of 252 yuan did not exceed 300 yuan
(80 + 252 △ 0.9) × 0.8 = 288 yuan
The original price of 252 yuan is more than 300 yuan
(80 + 252 △ 0.8) × 0.8 = 316 yuan
6.54 km / h
　　6km=6000m,1h=3600s
1.5 Xiaoming's journey: 6000 △ 3600 × 1.5 = 2.5m
Vehicle speed: (20 + 2.5) △ 1.5 = 15m / S = 54km / h
Xiao Hua and Xiao Ming work out an integral multiplication problem (2x + a) (3x + b) at the same time. Xiao Hua copies "a" in the first polynomial into - A, and the result is 6x2 + 11x-10; Xiao Ming copies "3x" in the second polynomial into x, and the result is 2x2-9x + 10. (1) do you know the values of a and B in the formula? (2) Please work out the correct result of this problem
(1) According to the meaning of the question, we can get: (2x-a) (3x + b) = 6x2 + (2b-3a) x-ab = 6x2 + 11x-10; (2x + a) (x + b) = 2x2 + (a + 2b) x + AB = 2x2-9x + 10, ｜ 2B − 3A = 11A + 2B = − 9, the solution is: a = - 5, B = - 2; (2) the correct formula is (2x-5) (3x-2) = 6x2-19x + 10
Given the set a = {x | - 1 ≤ x ≤ 3}, B = {x | m-2 ≤ x ≤ m + 2}. (1) if a ∩ B = {x | 0 ≤ x ≤ 3}, find the value of real number m; (2) if a is contained in CRB, find M
Find the value range of M
(1) ---: a = [- 1,3], a ∩ B = [0,3], indicating that the infimum of B is 3 (INF B = 3), that is, m-2 = 3, M = 5, that is, B = [3,7], that is, M = 5
(2) ---: CRB = (- ∞, m-2) U (M + 2, + ∞), if a is contained in CRB, namely: 3
1. If a ∩ B = {x | 0 ≤ x ≤ 3}, m-2 = 0
2. A contained in CRB, get: m-2 ≤ - 1, M + 2 > = 3, get: m, = 1?
It is known that the square of 3 (X-Y) - 5x-2 = 2x-7y-4, and the value of X-Y is obtained
3（x-y）^2-5x-2x+7y-2+4=0
3（x-y）^2-7(x-y)+2=0
(x-y-2)(3(x-y)-1)=0
X-Y = 2 or X-Y = 1 / 3
Seeking analysis: the big problem of high school mathematics physics always makes mistakes in basic mathematics calculation
When calculating mathematics, it's not so tragic. Once it's changed to physics, there are 10 Mistakes and 8 mistakes. Anxiety
As a person who has experienced the college entrance examination, I would like to tell you that I have had similar feelings. After my analysis, I think the reason for the problem is not your lack of mathematical ability. The key to the problem is that you don't fully understand the physics problems. Because you don't know much about the physics problems, you will be busy doing them, The solution is to let yourself really understand the physics problem and the physical process first! If you have success with your heart, you will not be wrong!
Why? I've always been above 140 in math, and I'm very careful in physics. Let me tell you something, just think about the topic when you do it. Don't think about it. Distracted and distracted are most likely to make mistakes. Come on, you'll be better. \(^o^)/~
Just take your time
It's the same as when I first started school,
Trying to get a high score will relieve the pressure
Be careful when you do the test. If you can't listen to the teacher carefully in class, you can find an educational institution for training.
Reference: help test 1 to 1