Mọi người giúp mk nha
Giải đầy đủ nhé
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\(ĐKXĐ:x\ne2\)
\(P=\dfrac{1}{x-2}-\dfrac{x^2+8}{x^3-8}-\dfrac{4}{x^2+2x+4}\)
\(=\dfrac{x^2+2x+4}{\left(x-2\right)\left(x^2+2x+4\right)}-\dfrac{x^2+8}{\left(x-2\right)\left(x^2+2x+4\right)}-\dfrac{4\left(x-2\right)}{x^2+2x+4}\)
\(=\dfrac{x^2+2x+4-x^2-8-4x+8}{\left(x-2\right)\left(x^2+2x+4\right)}\)
\(=\dfrac{4-2x}{\left(x-2\right)\left(x^2+2x+4\right)}\)
\(=\dfrac{-2\left(x-2\right)}{\left(x-2\right)\left(x^2+2x+4\right)}\)
\(=-\dfrac{2}{x^2+2x+4}\)
(2+x).(2-x) = (4-x2)
* hằng đẵng thức đáng nhớ
ý mk là nhân hai cái với nhau chứ ai cũng bt là = (4-x^2) rồi.
giống kiểu (2+x).(2+x)=4+2x+2x+x^2
\(\dfrac{3}{5}\)a3b x (10ab3 - \(\dfrac{5}{3}\)b2 + \(\dfrac{5}{6}\)ab)
=\(\dfrac{3}{5}\)a3b . 10ab3 - \(\dfrac{3}{5}\)a3b. \(\dfrac{5}{3}\)b2 + \(\dfrac{3}{5}\)a3b . \(\dfrac{5}{6}\)ab
= 6a4b4 - a3b3 + \(\dfrac{1}{2}\) a4b2
1.I saw her last night.
· -> When .......................did you see her ?...................................................................................................
· 2.She went to the doctor because she was sick.
· -> Why ......did she go to the doctor?....................................................................................
· 3.Nga brushes her teeth three times a day.
· -> How often .........does Nga brush her teeth a day...........................................................................
· 4.She was absent from class yesterday because she was ill.
· ->Why .............was she absent from class yesterday.............................................................
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· -> How tall.........are you.................................................................................
· 6.My sister is 45 kilos.
· -> How heavy.............is your sister....................................................................
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· -> What ..............would you like to see...........................................................................
· 8.She likes pop music.
· -> What ..........kind of music does she likes ...............................................................................
· 9.I like programs about teenagers.
· -> What kinds of programs..do you like?.........................................................
· 10.We met her at the City’s theater last night.
· -> Where ...........did you meet her?...........................................................................
· 11.She woke up at six o’clock yesterday morning.
· -> What time …did she wake up yesterday morning…………………………………………………………………………
· 12.The students had a medical check-up yesterday morning.
· -> When ………did the students have a medical check up………………………………………………………………
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· -> How much ……is the blue dress………………………………………………………………………
· 14.I bought this dress in Nha Trang.
-> Where …did you buy this dress ……………………………………………………………………………..