hinh nhu bn chep sai dau bai

\(\frac{1}{10}\cdot\frac{2}{3}\cdot\frac{3}{4}\cdot\frac{4}{5}\cdot\frac{5}{6}\cdot\frac{6}{5}\cdot\frac{5}{4}\cdot\frac{4}{3}\cdot\frac{3}{2}=\frac{1}{10}\)

\(\frac{1}{10}\times\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}\times\frac{5}{6}\times\frac{6}{5}\times\frac{5}{4}\times\frac{4}{3}\times\frac{3}{2}\)\(\frac{3}{2}\)

\(=\frac{1}{10}\times\left(\frac{2}{3}\times\frac{3}{2}\right)\times\left(\frac{3}{4}\times\frac{4}{3}\right)\times\left(\frac{4}{5}\times\frac{5}{4}\right)\times\left(\frac{5}{6}\times\frac{6}{5}\right)\)

\(=\frac{1}{10}\times1\times1\times1\times1\)

\(=\frac{1}{10}\)

#Chúc bạn học tốt !

#k cho mình nhé ?

\(\frac{5}{9}\) + 2 = \(\frac{5}{9}\) + \(\frac{18}{9}\) = \(\frac{23}{9}\)

 5/9 + 2 = 5/9 + 18/9

            = 23/9

Chúc bạn hok tốt nha!@#

=21/16

k cho mình nhé

A = \(\frac12\) x \(\frac23\) x \(\frac34\) x \(\frac45\) x ... x \(\frac{2012}{2013}\)

A = \(\frac{2\times3\times4\times\ldots\times2012}{2\times3\times4\times\ldots\times2012}\) x \(\frac{1}{2013}\)

A = 1 x \(\frac{1}{2013}\)

A = \(\frac{1}{2013}\)

`1/2xx2/3xx3/4xx4/5xx...xx2012/2013`

`=(1xx2xx3xx...xx2012)/(2xx3xx4xx...xx2013)`

`=1/2013xx(2xx3xx...xx2012)/(2xx3xx...xx2012)`

`=1/2013xx1`

`=1/2023`

Vậy: `..`

 1/3x-2/5(x+1)=0

 1/3x-2/5x-2/5=0

 -1/15x-2/5=0

-1/15x=6/15

x=-6

\(A=\frac{1}{3}.x-\frac{2}{5}.\left(x+1\right)=\)\(0\)

\(A=\frac{1}{3}.x-\frac{2}{5}x-\frac{2}{5}\)\(=0\)

\(A=x.\left(\frac{1}{3}-\frac{2}{5}\right)-\frac{2}{5}\)\(=0\)

\(A=x.\frac{-1}{15}=\frac{2}{5}\)

\(A=\frac{2}{5}\div\frac{-1}{15}\)

\(A=-6\)

Vậy \(A=-6\)

\(\frac{x\times7}{x}\Rightarrow x=1\)

\(\frac{x\times6}{x}\Rightarrow x=1\)

VẬY X=1

\(\frac{x\cdot7}{x}=7\)

\(\Rightarrow\frac{x}{x}.\frac{7}{x}=7\)

\(\Rightarrow1.\frac{7}{x}=7\Rightarrow x=1\)

cái kia giống thế

\(x+\frac{1}{2}+x+\frac{1}{4}+x+\frac{1}{8}+x+\frac{1}{16}=\frac{23}{16}=>4x=\frac{23}{16}-\frac{15}{16}=\frac{1}{2}=>x=\frac{1}{8}\)

(xx4)+1/2+1/4+1/8+1/16=23/16

xx4=23/16-(1/2+1/4+1/8+1/16)

xx4=1/2

x=1/2:4

x=1/8

Đúng 100% nhé Nhớ k cho mình đấy

Đáp án lần lượt là: \(\frac{23}{36};\frac{31}{7};\frac{1}{6};\frac{3}{5}\)

#Hk_tốt

#Ken'z

NGọc Ken nhanh nhất