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If LG2, LG (2x-1), LG (2x + 3) are in arithmetic sequence, then the value of X is equal to______ ．
∵ LG2, LG (2x-1), LG (2x + 3) are in arithmetic sequence, ∵ 2lg (2x-1) = LG2 + LG (2x + 3), ∵ LG (2x-1) 2 = LG (2x + 1 + 6), which is transformed into (2x-1) 2 = 2x + 1 + 6, sorted into (2x) 2-4 × 2x-5 = 0, that is, (2x-5) (2x + 1) = 0, (*) ∵ 2x > 0, ∵ 2x + 1 > 1, ∵ 2x + 1, ∵ (*) into 2x = 5, which is transformed into logarithmic formula x = log25
1, - 2,3, - 4,5, - 6,7, - 8. General term formula of sequence
-1 to the power of N + 1
Can the mathematical formula be calculated skillfully
For example:
What is the result of multiplying the sum of 8 products of 7.4 by 1.25?
The product sum of 8 7.4 is multiplied by 1.25
8*7.4*1.25
=8*1.25*7.4
=10*7.4
=74
Complete square formula solution!
When Xiao Ming was doing his homework, he accidentally dropped a drop of ink on a math problem. The problem became: x ^ 2 () x + 4, I can't see what the number in front of X is. I only know that I can match this quadratic trinomial into a complete square. Can you help him find the number covered by the ink
x^2+()x+4=(x+m)^2=x^2+2mx+m^2
So: m ^ 2 = 4, the solution is: M = 2 or M = - 2
So: the occluded digit 4 or - 4
A three digit number, divided by 235, more than 7, divided by 400, more than 58, divided by 603, more than 33
235-7=228 400-58=342 603-33=570
According to the meaning of the title, 228 342 570 are all integral multiples of a certain number
The greatest common divisor of three numbers is 114
What you want is 114
How do you understand that the old lady opened a window for her?
A lively little girl broke her leg in skiing and was admitted to the hospital. She lay on the bed and couldn't move. She lived like a year, weeping all day. She was in the same ward with a kind old lady near the window. Her wound was almost healed, The little girl wants to see the scenery out of the window. But she can't sit up with splints on her legs. The bed is not near the window, so she can't enjoy the scenery out of the window, "Can't help asking:" what do you see? Can you tell me? "The old lady readily agreed:" OK! "So, the old lady gave her a detailed description of the scenery outside the window and what happened every day. While listening to it, the little girl imagined the beautiful scenery in the snow. She couldn't help feeling relaxed and happy, and her depression suddenly disappeared. A month later, The old lady was discharged. The little girl couldn't wait to ask the doctor to transfer her to the hospital bed by the window. She struggled to get up, stretched her neck, looked out of the window and was shocked: there was a black wall outside the window! But the little girl suddenly realized that the old lady had opened a window for her!
Today's solution
If you want to share it, give it to me
Random answer nerve
Because the old lady brought hope to the little girl in her infinite sorrow, which made her no longer melancholy and happier
I'm in fifth grade like you
Reflections on reading 22. The Enlightenment of dropping water wears away stone
Today, I read an article called "the Enlightenment of water dropping through stone". There is a sentence in the article that makes me like this little water drop that can "drop through stone": the little water drop perseveres, carves the moon and carves the sun, finally drops through the stone, becoming a great wonder in today's Taiji cave
Solution equation: (4x / X-2) - 1 = 3 / 2-x
4x/(x-2)-1=3/(2-x)
All times X-2 to get: 4x - (X-2) = - 3
4x-x+2=-3
3x=-5
x=-5/3
It is the root of the original equation
How to calculate 0.37 * 99 + 0.37?
By the way, you can calculate 1.23 + 3.77-0.56-1.44 and 3.14/0.4/2.5, and (5.28 + 2.28 + 5.28 + 5.28) * 0.25! Simple calculation, out of formula calculation! Please reply as soon as possible, too urgent ~ (≥ ▽≤)/~
0.37*99+0.37=0.37*（99+1）=0.37*100=371.23+3.77-0.56-1.44=（1.23+3.77）-（0.56+1.44）=5-2=33.14/0.4/2.5=3.14/(0.4*2.5)=3.14/1=3.14（5.28+5.28+5.28+5.28）*0.25=5.28×4×0.25=5.28×1=5.28
A chemistry fill in the blanks
The mass ratio of O2 to O3 is 0_____ And the ratio of the number of molecules is_____ And the ratio of the number of atoms is_____ Under the same condition, the volume ratio is_____ Under the same condition, the density ratio is_____ .
3:2
3:2
1:1
3:2
2:3
RELATED INFORMATIONS
- 1. It is known that LG2, LG (2 ^ x-1), LG (2 ^ x + 3) form an arithmetic sequence to find X
- 2. Calculation: LG25 + LG2 · LG50 + (LG2) 2
- 3. Calculation: (1) LG25 + lg2lg50 + (LG2) 2 (2) 813 + (12) − 2 + (27-1 + 16-2) 0 + 416
- 4. If the two equations (LG ^ 2x) + LG6 * lgx + LG2 * Lg3 = 0 are X1 and X2, then the values of X1 and X2 are
- 5. Is the negative half power of y = x even or odd
- 6. On the symmetry of function image 1. If f (x) + F (A-X) = B, then the two images are symmetric with respect to (A / 2, B / 2) How to prove it? 2. Are there any relevant conclusions? 3. We know that f (x) + F (- x) = 3. Why can we find the value of F-1 (x-1) + F (4-x) and why it also applies to the first conclusion? F-1 (x-1) + F (4-x) is the inverse function of F-1 (x-1) + F-1 (4-x).
- 7. Given the - 2 power of the function y = x, (1) is it an odd function or an even function? (2) what kind of symmetry does its image have? (3) is it in (0, emergency
- 8. Given the function f (x) = 4x-2x + 1 + 3. (1) when f (x) = 11, find the value of X; (2) when x ∈ [- 2, 1], find the maximum and minimum value of F (x)
- 9. Given that f (x-1) is odd, f (x + 3) is even, f (0) = 1, then f (8)=______ ．
- 10. We know that the function y = f (x) is even on R, and if x > = 0, f (x) = x2 power - 2x, then
- 11. The solution set of the equation LG (4x + 2) = lg2x + Lg3 is______ ．
- 12. If f (x) is an even function, its domain of definition is R and it is a decreasing function on [0, + ∞), then the relationship between F (- 34) and f (a2-a + 1) is positive______ ．
- 13. Given that y = f (x + 2) is an even function of the domain on R, and if x ≥ 2, f (x) = 3 ^ X-1, then the value of F (1) is Given that y = f (x + 2) is an even function of the domain on R, and if x ≥ 2, f (x) = 3 ^ X-1, then the value of F (1) is A .2 B.-8\9 C.8 D.26
- 14. What is the meaning of △ in Shengjin formula, and how to use this formula to solve the equation of the third power of x = x + 24?
- 15. It is known that the function f (x) is an even function defined in the interval from negative infinity to positive infinity. When x belongs to the interval from negative infinity to 0, FX = X
- 16. Given that F X is an even function defined on R, when x > = 0, f (x) = (x-1) 3 + 1, find the analytic expression of F (x)
- 17. The third power of (x-2y) is multiplied by the fourth power of (2y-x),
- 18. 25 (x-2y) - 4 (x-2y) I'm going to crash
- 19. Function domain y = LG (x ^ 2 + 3x-28)
- 20. The definition field of function y = 1 / √ (3x-2) + LG (3x-1) is?