và là sao

B= 1/2 x 2/3 x 3/4 x ...........x 2002/2003 x 2003/2004

1 x 2 x 3 x 4 x .............x 2002 x 2003

2 x 3 x 4 x .............x 2003 x 2004

1

 2004

A=-1/10

B câu b có và 1/5 là sao pn

https://khoahoc.vietjack.com/question/661489/bieu-thuc-a-3-45-9-6-7-4-3-12-5-11-3-co-gia-tri-3-11

a, \(5-\left(\frac{a}{b}+\frac{1}{2}\right)=2\frac{1}{3}\)   =>  \(\frac{a}{b}+\frac{1}{2}=5-2\frac{1}{3}\) =>  \(\frac{a}{b}+\frac{1}{2}=\frac{8}{3}\)  => \(\frac{a}{b}=\frac{8}{3}-\frac{1}{2}\) =>  \(\frac{a}{b}=\frac{13}{6}\)

b, \((\frac{3}{4}+2\frac{1}{2}):\frac{3}{5-3}=\left(\frac{3}{4}+\frac{5}{4}\right):\frac{3}{5}-1=\frac{9}{4}:\frac{-2}{5}=\frac{-45}{8}\)

a, 5-(\(\frac{a}{b}\)+\(\frac{1}{2}\))=2\(\frac{1}{3}\)

<=>5-\(\frac{a}{b}-\frac{1}{2}\)=\(\frac{7}{3}\)

<=>\(\frac{a}{b}=5-\frac{1}{2}-\frac{7}{3}\)

<=>\(\frac{a}{b}=\frac{13}{6}\)

b,(\(\frac{3}{4}\)+2\(\frac{1}{2}\)):\(\frac{3}{5}\)-3

=(\(\frac{3}{4}\)+\(\frac{5}{2}\)).\(\frac{5}{3}\)-3

=\(\frac{23}{4}\).\(\frac{5}{3}\)-3

=\(\frac{115}{12}\)-3

=\(\frac{115-36}{12}\)

=\(\frac{79}{12}\)

a) \(5-\left(\frac{a}{b}+\frac{1}{2}\right)=2\frac{1}{3}\)

\(\Rightarrow5-\left(\frac{a}{b}+\frac{1}{2}\right)=\frac{7}{3}\)

\(\Rightarrow\frac{a}{b}+\frac{1}{2}=5-\frac{7}{3}\)

\(\Rightarrow\frac{a}{b}+\frac{1}{2}=\frac{8}{3}\)

\(\Rightarrow\frac{a}{b}=\frac{8}{3}-\frac{1}{2}\)

\(\Rightarrow\frac{a}{b}=\frac{13}{6}\)

Vậy \(\frac{a}{b}=\frac{13}{6}\)

b) \(\left(\frac{3}{4}+2\frac{1}{2}\right):\frac{3}{5}-3\)

\(=\left(\frac{3}{4}+\frac{5}{2}\right):\frac{3}{5}-3\)

\(=\frac{13}{4}:\frac{3}{5}-3\)

\(=\frac{65}{12}-3\)

\(=\frac{29}{12}\)

Học tốt #

P = 4\(x^2\).\(x\) + (3³ + 2²)

P = 4\(x^3\) + ( 27 + 4)

P = 4\(x^3\) + 31

Thay \(x\) = 1 vào P ta có:

P = 4.1³ + 31 

P = 35

Thay \(x\) = 3 vào P ta có:

P = 4.3³ + 31

P = 4.27 + 31

P = 108 + 31

P = 139

b) Thay a=25, b=9 vào biểu thức D=1+2(a+b)-\(4^3\) ta có:

\(1+2.\left(25+9\right)-4^3\)

\(\Rightarrow3.34-64\)

\(\Rightarrow102-64\)

\(=38\)

Vậy giá trị của biểu thức D=1+2(a+b)- \(4^3\) khi a=25, b=9 là: 38

câu a mink chưa làm được nhé

 Vì \(\frac{1}{33}>\frac{1}{34}>\frac{1}{35}>\frac{1}{36}\)

\(\Rightarrow M>\frac{1}{36}+\frac{1}{36}+\frac{1}{36}+\frac{1}{36}\)\(\)

\(\Rightarrow M>\frac{4}{36}=\frac{1}{9}\)

Mà \(\frac{1}{9}>\frac{1}{10}\)

\(\Rightarrow\)\(M>\frac{1}{9}>\frac{1}{10}\)

Vậy : M > N