a) 3^{2x}=8
2x=\log_3 8
x=\dfrac{\log_3 8}{2}\approx 0.95
b) \log(2x+7)=-1
2x+7=0.1
x=-\dfrac{69}{20}=-3.45
c) 7^{x+3}=6^{2x}
(x+3)\ln7=2x\ln6
x=\dfrac{3\ln7}{2\ln6-\ln7}\approx 3.56
d) 2^{6x-20}=3^{4x-4}
(6x-20)\ln2=(4x-4)\ln3
x=\dfrac{20\ln2-4\ln3}{6\ln2-4\ln3}\approx 8.57
如果有日你阿爸阿媽唔比你玩IG同Thread,你會點?
E人 高 成績好 體育生 (not short n* potato)
解釋一下alkene reacting with KMnO4&NaOH (cold)同RCO3H&H3O+ 都係加咗兩個OH,係乜嘢驅使佢哋嘅stereochemistry different?
• KMnO₄、NaOH(低溫)
烯與過錳酸鉀反應時,會直接形成環狀錳酸酯中間體,兩個氧原子被固定在雙鍵的同一側,水解後兩個–OH仍在同面,因此得到 syn‑diol(順式雙醇)。
• RCO₃H + H₃O⁺
先由過氧酸將烯轉成環氧化物,此時氧在單面;後續酸性水解時,水必須從環的反面做背擊(類似SN2),打開三元環,最終兩個–OH分處兩側,得到 anti‑diol(反式雙醇)。
兩者立體不同,關鍵在於中間體結構與親核試劑的進攻方向。
Don’t play me bro I k is u - from earth
broo im asking a question
你應該是想問:如何證明 E=mc^2(質能等效),我用繁體、超簡短給你講:
1. 愛因斯坦從狹義相對論出發。
2. 結合能量、動量與光速不變原理。
3. 推導出:質量其實就是能量的一種形式。
4. 最終得到關係式:
E=mc^2
5. 結論:質能可以互換,質量對應巨大能量。
Can u find no of ways for 2 CH3- groups arrange on a benzene ring
This is the classic case of dimethylbenzene (xylene) isomers.
Step 1
Fix one methyl group on any carbon (benzene is symmetric, so position 1 is arbitrary).
We now place the second methyl group on the remaining 5 carbons, but symmetry reduces them to 3 unique positions:
1. 1,2‑dimethylbenzene (ortho‑xylene)
2. 1,3‑dimethylbenzene (meta‑xylene)
3. 1,4‑dimethylbenzene (para‑xylene)
There are 3 distinct ways to arrange two \boldsymbol{-CH_3} groups on a benzene ring.
ʕʘ‿ʘʔ💤💤你好呀晚安 睡覺前~先來cases
問個簡單的: Please explain how Beriplex use in Emergency Medicine 💊
Main point (Beriplex in Emergency Medicine)
Beriplex is a fast‑acting prothrombin complex concentrate (PCC) used in emergencies to rapidly reverse severe bleeding by quickly replacing clotting factors, especially in warfarin overdose or life‑threatening haemorrhage.
That is showing, I mean prove it XD