A

B. x = 1/15 và x = - 1/2

75 nhé bạn

TL :

   ( 15 x 15 ) : 2 x ( 15 x 15 ) : 2 x ( 15 x 15 ) : 2 + ( 0 + 1 + 2 + 2 + 3 + 45 ) x 0

= 0

=> vì : tất cả số nào nhân vs 0 đều = 0

_HT_

1423828.125 

        - ht -

1/2 x 2 - 1/3 x 2 + 1/15 x 2

=( 1/2 - 1/3 + 1/15 ) x 2

=7/30 x 2

=7/15

=1/4-169+1/225

=khoảng 169

mink trả lời rồi k cho mình nha

hộ mik nha

a)\(2.x-\frac{3}{2}=\frac{1}{2}\)

\(2x=\frac{4}{2}\)

\(x=\frac{4}{2}:2\)

\(x=1\)

Vậy x=1

b)\(\frac{8}{13}.x+\frac{5}{13}.x=\frac{1}{10}\)

\(x.\left(\frac{8}{13}+\frac{5}{13}\right)=\frac{1}{10}\)\

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

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

Vậy x=\(\frac{1}{10}\)

c)\(\frac{2}{15}+\frac{7}{15}.x=\frac{1}{15}\)

\(\frac{7}{15}x=\frac{-1}{15}\)

x=\(\frac{-1}{7}\)

Vậy \(x=\frac{-1}{7}\)

\(\frac{3}{2}\cdot x-\frac{3}{2}=\frac{1}{2}\)                           \(\frac{8}{13}\cdot x+\frac{5}{13}\cdot x=\frac{1}{10}\)

\(\frac{3}{2}\cdot x=\frac{3}{2}+\frac{1}{2}=2\)                    \(\left[\frac{8}{13}+\frac{5}{13}\right]\cdot x=\frac{1}{10}\)

\(x=2:\frac{3}{2}\)                                            \(1\cdot x=\frac{1}{10}\)

x=\(\frac{4}{3}\)                                                     \(x=\frac{1}{10}:1\)

Vậy x=\(\frac{4}{3}\)                                               \(x=\frac{1}{10}\)

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

c,\(\frac{2}{5}+\frac{7}{15}\cdot x=\frac{1}{15}\)

\(\frac{7}{15}\cdot x=\frac{1}{15}-\frac{2}{5}=\frac{-1}{3}\)

\(x=\frac{-1}{3}:\frac{7}{15}\)

\(x=\frac{-5}{7}\)

Vậy x=\(\frac{-5}{7}\)

Chứng minh P>3 nha!!! 

Chứng minh P>3 nha!!! 

a,     (\(\dfrac{9}{10}\) - \(\dfrac{15}{16}\)) \(\times\) ( \(\dfrac{5}{12}\) - \(\dfrac{11}{15}\) - \(\dfrac{7}{20}\))

=  (\(\dfrac{72}{80}\) - \(\dfrac{75}{80}\))  \(\times\) (\(\)\(\dfrac{25}{60}\) - \(\dfrac{44}{60}\)  - \(\dfrac{21}{60}\))

= - \(\dfrac{3}{80}\)  \(\times\) (- \(\dfrac{2}{3}\))

= \(\dfrac{1}{40}\) 

b, (-1)³ + (- \(\dfrac{2}{3}\))² : 2\(\dfrac{2}{3}\) + \(\dfrac{5}{6}\)

=  -1³ +   \(\dfrac{4}{9}\) : \(\dfrac{8}{3}\) + \(\dfrac{5}{6}\)

= -1 + \(\dfrac{4}{9}\) \(\times\) \(\dfrac{3}{8}\) + \(\dfrac{5}{6}\)

= -1 + \(\dfrac{1}{6}\) + \(\dfrac{5}{6}\)
= -1 + 1

= 0

c, 15 \(\times\) (- \(\dfrac{1}{5}\))² + \(\dfrac{1}{5}\) - 2 \(\times\) (- \(\dfrac{1}{2}\))³ - \(\dfrac{1}{2}\)

= 15 \(\times\) \(\dfrac{1}{25}\) + \(\dfrac{1}{5}\) - 2 \(\times\) (- \(\dfrac{1}{8}\)) - \(\dfrac{1}{2}\)

=  \(\dfrac{3}{5}\)  + \(\dfrac{1}{5}\) + \(\dfrac{1}{4}\) - \(\dfrac{1}{2}\)

= \(\dfrac{4}{5}\) - \(\dfrac{1}{4}\)

= \(\dfrac{11}{20}\)

\(1,\frac{2}{3}+\frac{4}{9}+\frac{1}{5}+\frac{2}{15}+\frac{3}{2}-\frac{17}{18}\)

\(< =>\frac{4}{9}+\frac{3}{2}+\left(\frac{2}{3}+\frac{1}{5}+\frac{2}{15}\right)-\frac{17}{18}\)

\(< =>\frac{8}{18}+\frac{27}{18}+\left(\frac{10}{15}+\frac{3}{15}+\frac{2}{15}\right)-\frac{17}{18}\)

\(< =>\frac{35}{18}+1-\frac{17}{18}\)

\(< =>\frac{53}{18}-\frac{17}{18}\)

\(< =>2\)

\(2,\frac{13}{28}\cdot\frac{5}{12}-\frac{5}{28}\cdot\frac{1}{12}\)

\(< =>\left(\frac{13}{28}-\frac{5}{28}\right)\cdot\left(\frac{5}{12}-\frac{1}{12}\right)\)

\(< =>\frac{2}{7}\cdot\frac{1}{3}\)

\(< =>\frac{2}{21}\)

\(3,\frac{19}{4}\cdot\frac{15}{23}-\frac{15}{4}\cdot\frac{7}{23}+\frac{15}{4}\cdot\frac{11}{23}\)

\(< =>\frac{285}{92}-\frac{105}{92}+\frac{165}{92}\)

\(< =>\frac{15}{4}\)

cảm ơn bạn nha bạn chắc chăn đúng không

bạn viết dấu gạch ngang của phân số như thế nào đấy nguyen thi hien

Áp dụng BĐT phụ \(a^2+b^2\ge\dfrac{1}{2}\left(a+b\right)^2\Leftrightarrow\left(a-b\right)^2\ge0\)

\(A\ge\dfrac{1}{2}\left(x+y+\dfrac{1}{x}+\dfrac{1}{y}\right)^2\ge\dfrac{1}{2}\left(x+y+\dfrac{4}{x+y}\right)^2=\dfrac{1}{2}\left(1+\dfrac{4}{1}\right)^2=\dfrac{25}{2}\)

Dấu "=" \(x=y=\dfrac{1}{2}\)