=2777+252

=3029

`= 2777 + 252`

`= 3029`

2777+252=3029

2525+5252+2524

=7777+2524

=10301

=7777+2524=10301

10301

81 + 243 + 19

= ( 81 + 19 ) + 243

= 100 + 243

= 343

( x - 2525 - 2525 ) +6262 + 321 = 10000

 ( x - 5050 ) + 6583 = 10000

  x - 5050 = 3417

  x = 8467

315 \(x\)(46-x) = 401

  46 - x = \(\frac{401}{305}\)

   -x =\(-\frac{13629}{305}\)

    x = \(\frac{13629}{305}\)

49  \(x\)313 + 187  \(x\)7² +350

=14398 + 9163 + 350

=23911

250 - 160 - ( 18 - 12 ) ²

= 90 - 6²

=54

\(x\)là nhân nha

chúc bn học tốt

\(\frac{2323}{2525}+\frac{212121}{252525}\)

\(=\frac{23\times101}{25\times101}+\frac{21\times10101}{25\times10101}\)

\(=\frac{23}{25}+\frac{21}{25}\)

\(=\frac{44}{25}\)

\(\frac{2323}{2525}+\frac{212121}{252525}\)

\(=\)\(\frac{23}{25}+\frac{21}{25}\)

\(=\frac{44}{25}\)

-2525/2929 > -217/245

-2525/2929 > -217/245

-2525/2929 < -217/245

\(\dfrac{2929}{2525}\cdot\dfrac{505050}{848484}\cdot\dfrac{42}{29}\)

\(=\dfrac{29}{25}\cdot\dfrac{50}{84}\cdot\dfrac{42}{29}\)

\(=\dfrac{29}{29}\cdot\dfrac{50}{25}\cdot\dfrac{42}{84}=1\cdot2\cdot\dfrac{1}{2}=1\)

ta có: \(\frac{1717}{2525}=\frac{17}{25}\)

\(\frac{515151}{727272}=\frac{51}{72}=\frac{17}{24}>\frac{17}{25}\)

\(\Rightarrow\frac{1717}{2525}< \frac{515151}{727272}\)

Ta có:

\(\frac{1717}{2525}=\frac{17}{25}\)

\(\frac{515151}{727272}=\frac{51}{72}=\frac{17}{24}\)

Mà: \(\frac{17}{25}< \frac{17}{24}\)

\(\Rightarrow\frac{1717}{2525}< \frac{515151}{727272}\)

tks 2 bạn nha

Đáp án đúng : B