1717/1919=17/19

171717/191919=17/19

Vậy  1717/1919 = 171717/191919

1717/1919 = 17.101/19.101

171717/191919 = 17.10101/19.10101

→ 17/19 = 1717/1919 = 171717/191919

Ta thay : 17/19 = 17x1/19x1

              1717/1919 = 17x101/19x101

              171717/191919 = 17x10101/19x10101

Nen 17/19 = 1717/1919 = 171717/191919.

 Nho k minh nha!

Ta thay : 17/19 = 17x1/19x1

              1717/1919 = 17x101/19x101

              171717/191919 = 17x10101/19x10101

Nen 17/19 = 1717/1919 = 171717/191919.

 Nho k minh nha!

1313/1717 = ( 1313 :101)/(1717:101)=13/17

171717/191919=(171717:10101)/(191919:10101)=17/19

231231/343343=(231231:7007)/(343343:7007)=33/49

373737/494949=(373737:10101)/(494949:10101)=37/49

\(\frac{1313}{1717}=\frac{1313:101}{1717:101}=\frac{13}{17}\)

\(\frac{131313}{171717}=\frac{131313:10101}{171717:10101}=\frac{13}{17}\)

\(\dfrac{1313}{1717}=\dfrac{101x13}{101x17}=\dfrac{13}{17}\)

\(\dfrac{131313}{171717}=\dfrac{10101x13}{10101x17}=\dfrac{13}{17}\)

Vậy \(\dfrac{1313}{1717}=\dfrac{131317}{171717}\)

\(\dfrac{1313}{1717}và\dfrac{131313}{171717}\\ \dfrac{1313}{1717}=\dfrac{13}{17}\\ \dfrac{131313}{171717}=\dfrac{13}{17}\\ \Rightarrow\dfrac{1313}{1717}=\dfrac{131313}{171717}\)

1313/1717=131313/171717

(2525/3737-171717/191919+19/21) x (1/6+1/4-5/12)

=(25/37-17/19+19/21) x 0

=0

a) Vì 25 > 20 nên \(\frac{25}{20}>1\) ; 25251 < 26261 => \(\frac{25251}{26261}\frac{25}{20}>\frac{25251}{26261}\)

Câu hỏi của bạn rất giống mình. Nếu bạn biết cách giải của 2 phần còn lại rồi thì giải giúp mình nhé ! Mình cảm ơn rất nhiều

b) Ta có : \(\frac{33\cdot10^3}{2^3\cdot5\cdot10^3+7000}=\frac{33\cdot10^3}{10^3\cdot\left(2^3\cdot5+7\right)}=\frac{33}{47}=\frac{3663}{5247}\)

Rồi bạn tự tính

Nhắn tin cho mik mình giải nốt câu c cho!!

\(=\left(\frac{25x101}{37x101}-\frac{17.10101}{19.10101}+\frac{19}{21}\right)x\left(\frac{1}{6}+\frac{1}{4}-\frac{5}{12}\right)\)

\(=\left(\frac{25}{37}-\frac{17}{19}+\frac{19}{21}\right)x\frac{2+3-5}{12}\)

=\(=\left(\frac{25}{37}-\frac{17}{19}+\frac{19}{21}\right)x\frac{0}{12}=0\)

\(A=\frac{5454}{5757}-\frac{171717}{191919}=\frac{54}{57}-\frac{17}{19}=\frac{54}{57}-\frac{51}{57}=\frac{3}{57}=\frac{1}{19}\)

\(\frac{5454}{5757}-\frac{171717}{191919}=\frac{54x101}{57x101}-\frac{17x10101}{19x10101}=\frac{54}{57}-\frac{17}{19}=\frac{1}{19}\)