Ta có: (X-3)²=(X-3)⁴

=>X-3)⁴-(X-3)²=0

=>(X-3)².(X-3.X-3-1)=0

=>(X-3)²= 0 hoặc X-3.X-3-1=0

Suy ra x=3;4

b, 3.(2^x+1)+2^x+2

=3.2^x+1+2^x+1.2

=2^x+1.(3+2)

=2^x+1.5=40

=2^x+1=40:5=8

=2^x+1=2³

=>x+1=3

=>x=3-1=2

=> là suy ra nha bạn

a) ( X - 3 ) ² = ( X - 3 )⁴ <=> X - 3 =1

                                       => X = 1+3

                                       => X = 4

Chú thích <=> : khi và chỉ khi

                   => : suy ra

b) Mình k^o biết ______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________-sorry-____________________________________________________________________________________________________________________________________-__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

a)x=4 vi neu nhu x<4 thi x^2>x^4, con neu x>4 thi X^2<x^4

b minh chua biet lam
 

Bạn vào link này nhé:https://h.vn/hoi-dap/question/39236.html

~Study well~

#Bạch_Dương_Chi#

\(B=\frac{1+2+2^2+2^3+...+2^{2008}}{1-2^{2009}}\)

Đặt: \(A=1+2+2^2+2^3+....+2^{2008}\)

\(\Rightarrow2A=2+2^2+2^3+2^4+...+2^{2009}\)

\(\Rightarrow2A-A=\left(2+2^2+2^3+2^4+...+2^{2009}\right)-\left(1+2+2^2+2^3+....+2^{2008}\right)\)

\(\Rightarrow2^{2009}-1\)

\(\Rightarrow B=\frac{2^{2009}-1}{1-2^{2009}}\)

Đặt \(A=1+2+2^2+2^3+...+2^{2008}\)

\(\Rightarrow2A=2+2^2+2^3+2^4...+2^{2009}\)

\(\Rightarrow2A-A=2+2^2+2^3+2^4...+2^{2009}-1-2-2^2-2^3-...-2^{2008}\)

\(\Rightarrow A=2^{2009}-1\)

\(\Rightarrow B=\frac{2^{2009}-1}{1-2^{2009}}=\frac{-1\left(1-2^{2009}\right)}{1-2^{2009}}=-1\)

\((3-\dfrac{7}{3}+\dfrac{1}{4}\))\(\div\)\(\left(4-\dfrac{31}{6}+\dfrac{9}{4}\right)\)=

\(\left(\dfrac{36}{12}-\dfrac{28}{12}+\dfrac{3}{12}\right)\div\left(\dfrac{48}{12}-\dfrac{62}{12}+\dfrac{27}{12}\right)\)=

\(\dfrac{11}{12}\div\dfrac{13}{12}\)=\(\dfrac{11}{12}\times\dfrac{12}{13}=\dfrac{11}{13}\)

Việt Nam muôn năm , vô địch rồi !!!!!!!!!!!!!!!!!!!!!!!!

U23 VN vô địch!! yeahhhhhhhhhhhhhhhhhhhhhhhh , vào đk chung kết là w hay rồi

Việt Nam thắng r !!!!Haha VN muôn năm tự hào là con cháu VN

đăng câu linh tinh nhiều thế bạn ,nhưng kb thì kb thôi -_-"

mk nè k mình nha

mk nha

cố lên 

VN vô địch

đương nhiên rồi,chắc chắn VIỆT NAM sẽ thắng mà bn Buồn của em

 As you know, there are many festivals around the world now and I think each festival has their own special things. But the festival I love best is Japan Summer Festival. I enjoyed this festival with my family in Japan last week. It was very wonderful. This festival had a lot of activities for people to attend. The outdoor activities and the interesting atmosphere are the most exciting in the festival. Everybody wore kimono or yukata to join the Summer Festival. It's a traditional clothes of Japanese. Anh of course I wore a kimono to take part in the festival. There, everyone can play and enjoy the festival together. I think it made people closer. What a wonderful memory! I love Japane so much.

ở MB nước ta thôi

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