Helppppp
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helppppp
helppppp
12 tháng 11 2021
\(\Rightarrow x=\dfrac{5}{12}-\dfrac{1}{4}=\dfrac{1}{6}\)
12 tháng 11 2021
\(0,25+x=\dfrac{5}{12}\Rightarrow\dfrac{1}{4}+x=\dfrac{5}{12}\)
\(\Rightarrow x=\dfrac{5}{12}-\dfrac{1}{4}=\dfrac{5-1.3}{12}=\dfrac{2}{12}=\dfrac{1}{6}\)
20 tháng 2 2022
\(a,\left(2x-1\right)^2-25=0.\\ \Leftrightarrow\left(2x-1\right)^2=25.\\ \Leftrightarrow\left[{}\begin{matrix}2x-1=5.\\2x-1=-5.\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=3.\\x=-2.\end{matrix}\right.\)
\(b,\left(x-3\right)\left(5-2x\right)=0.\\ \Leftrightarrow\left[{}\begin{matrix}x-3=0.\\5-2x=0.\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=3.\\x=\dfrac{5}{2}.\end{matrix}\right.\)
\(c,\dfrac{x+1}{x-2}+\dfrac{x-1}{x+2}-\dfrac{2\left(x^2+2\right)}{x^2-4}=0.\)
\(\left(x\ne\pm2\right).\)
\(\Leftrightarrow\dfrac{\left(x+1\right)\left(x+2\right)+\left(x-1\right)\left(x-2\right)-2x^2-4}{\left(x-2\right)\left(x+2\right)}=0.\)
\(\Rightarrow\left(x+1\right)\left(x+2\right)+\left(x-1\right)\left(x-2\right)-2x^2-4=0.\)
\(\Leftrightarrow x^2+3x+2+x^2-3x+2-2x^2-4=0.\)
\(\Leftrightarrow0=0\) (luôn đúng).
Helppppp
BT
19 tháng 1 2021
26 different
27 pronunciation
28 comfortable
29 performers
30 windy
31 unhealthy
32 childhood
33
34 flight
35 suddenly
PD
19 tháng 1 2021
IV.
26. different
27. pronunciation
28. comfortable
29. performers
30. windy
31. unhealthy
32. childhood
33. successfully
34. flights
35. suddenly
36. The girls said they didn't have enough money to buy a new car then.
37. The last time we ate this kind of seafood was many years ago.
38. Nile is the longest river in the world.
39. The fog prevented us from moving.
40. Erick takes no notice of my advice.