mình không hiểu đề bài

tim gia tri bieu thuc sao cho la so nho nhat

Với x < 1/3 thì :A= 5+1/3 - x = 16/3 - x

với x\(\ge\)1/3 thì A= 5 + x -1/3 = x+ 14 /3

( 1 + 3 + 5 + 7 + ... + 2003 + 2005 ) x ( 1212 x 27 - 2727 x 12 )

= ( 1 + 3 + 5 + 7 + ... + 2003 + 2005 ) x ( 32724 -32724 )

= ( 1 + 3 + 5 + 7 + ... + 2003 + 2005 ) x 0

= 0

vu cao minh sai roi

de keu la tinh nhanh ma

Thì thế gọi là tính nhanh còn gì

\(\sqrt{4x-20}\)- 3\(\sqrt{\dfrac{x-5}{9}}\)=2

= \(\sqrt{4x-4.5}\)-3\(\sqrt{\dfrac{x-5}{9}}\)=2

= 2.2\(\sqrt{x-5}\)-3.9\(\sqrt{x-5}\)=2

= -23\(\sqrt{x-5}\)=2

= -23.x-5=2

=-23x=2+5

-23x =7

x =\(\dfrac{-7}{23}\)

x= -0.3

\(x=9\)

A =118.75

B=125 -5 .(3.X -1) =25

5.(3.X-1) =100

3.X-1=20

3X =21

X=7

[130 - 3.(5.2⁴ - 5².2) : 2³]

= [ 130 - 3.30:2³]

= 130 - 11,25

= 118,75

b) 125 -5.(3x-1) = 5⁵:5³

125 -5.(3x-1) = 25

5.(3x-1) = 100

3x-1 = 20

3x = 21

x = 7

c) 4^x-1 + 4⁰ = 65

4^x:4 + 1 = 65

4^x:4 = 64

4^x = 256 = 4⁴

=> x = 4

\(4^{x-1}+1=65\)

\(4^{x-1}=65-1=64=4^3\)

\(x-1=3=>x=4\)

Chỉ có băng 2 thôi bạn bởi vì

4/3=1 hơn còn 9/4= 2 hơn nên ở giửa phải là 2

Chỉ có thể là 2 thôi

bởi vì 4/3 = 1 hơn còn 9/4=2 hơn

nên số ở giửa phải là 2 

đề bài là gì vậy bạn uiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

Thui mình giải đại nhennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn

=(x+x+x)+(1/2+2/3+3/6)

=3x+(3/6+4/6+3/6)

=3x+15

Hết ùiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

Bye nhennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn