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The square + 2x + 3 > 0 solution inequality of X
The square of X + 2x + 3 = (x + 1) & # + 2
Because (x + 1) ² ≥ 0
So (x + 1) ² + 2 ≥ 2
So the square of X + 2x + 3 > 0 holds, that is, for any real number x, it holds
So x ∈ R
The solution set of inequality (X-2) (x's square-2x-15) ＜ = 0 is
（x²-2x-15)/(x-2)≤0
(X-5) (x + 3) (X-2) ≤ 0 and X ≠ 2
The solution set is {x ｜ x ≤ - 3 or 2
Six times nine minus one half x equals 26.8. Solve this problem by solving the equation
Six times nine minus one half x is 26.8
54-1/2x=26.8
54-26.8=1/2x
1/2x=27.2
x=54.4
In the future, bridges will be built fast and well. Bridges like the Nanjing Yangtze River Bridge will be completed in a few months. What is the explanation
In this text, whale tells us to eat and eat. Take eat as an example
Give an example
The horse and the donkey are hunched side by side with 9 bags of rice. The donkey complains that he has entrusted too much. What do you complain about? If I take a bag of rice from your back, my burden will be twice as much as yours. How many bags of rice have the horse and the donkey hunched?
Set: Donkey camel x bag, horse camel y bag
x+y=9
2(x-1)=y+1
The solution is x = 4,
y=5
The distance between a and B is 135 kilometers. Two cars drive from a to B. the big car starts 5 hours earlier than the small car, and the small car arrives 30 minutes later than the big car
Let's know that the ratio of the speed of a small car to that of a large car is 5:2, and find the speed of two cars
Suppose that the car speed is 5x km / h and the cart speed is 2x km / h
135/2x-5=135/5x-0.5
45x=135*3
x=9
5x=45
2x=18
The speed of the car is 45 km / h, and that of the cart is 18 km / h
Let C be the midpoint of AB, ab = 10, and d be a point on ab. if CD = 2, find the length of BD
Because C is the midpoint of AB, ab = 10
So AC = BC = 5
Because CD = 2
So BD = 5-cd = 5-2 = 3 or BD = ab-ad = ab - (ac-cd) = 10 - (5-2) = 7
A unit held a spring tea party and bought four boxes of apples with the same weight. After taking out 24 kg from each box, the sum of the weight of the remaining apples in each box was just equal to the weight of the original box. So the weight of each box of apples is the same___ Kilogram
(24 × 4) △ 4-1, = 96 △ 3, = 32 (kg); answer: the original weight of each box of apples is 32 kg
Ask the answer to find the unknown number X: a * b = 3A + 4b, known 7 * x = 45, find X
7*x=45
3*7+4*x=45
21+4x=45
4x=45-21
4x=24
x=6
The fruit shop brought in 100 kg of apples and pears, accounting for three fifths of the total. Later, some pears were sold. Now, apples account for five fifths of the total,
How many kilos of pears do you sell? It's urgent at 3 o'clock today. Equations or fractional solutions are OK
100 × 3 / 5 = 60kg
60 △ 5 / 7 = 84kg
100-84 = 16 kg
Answer: sell 16 kg pears
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