191919+191919=
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
ta có : 191919 + 20202 = 212121
353535 + 70707 = 424242
vì 212121 < 424242
=> 191919 + 20202 < 353535 + 70707
đặt A=1919/2121=1919:101/2121:101=19/21
B=191919/212121=191919:10101/212121:10101=19/21
=>A=B=19/21
191919/282828
Ta có : 191919/282828 = \(\frac{191919:10101}{282828:10101}=\frac{19}{28}\)
Vậy đáp án là : 19/28
k cho tớ nha bn
191919/282828=\(\frac{191919:10101}{282828:10101}=\frac{19}{28}\)
1717/1919=17/19
171717/191919=17/19
Vậy 1717/1919 = 171717/191919
Có: \(\dfrac{5454}{5757}-\dfrac{171717}{191919}.\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}\)
=> \(\dfrac{54.101}{57.101}-\dfrac{17.10101}{19.10101}.\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}\)
=> \(\dfrac{18}{19}-\dfrac{17}{19}.\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}\)
=> \(\dfrac{21}{76}+\dfrac{1}{4}:x=\dfrac{2}{5}\)
=> \(\dfrac{1}{4}:x=\dfrac{47}{380}\)
=> x = \(\dfrac{95}{47}\)
=>18/19-17/19*3/4+1/4:x=2/5
=>1/4:x=2/5-18/19+17/19*3/4=47/380
=>x=1/4:47/380=95/47
\(=\dfrac{13}{17}\cdot\dfrac{17}{19}\cdot\dfrac{19}{13}=1\)
\(=\left(\frac{25x101}{37x101}-\frac{17.10101}{19.10101}+\frac{19}{21}\right)x\left(\frac{1}{6}+\frac{1}{4}-\frac{5}{12}\right)\)
\(=\left(\frac{25}{37}-\frac{17}{19}+\frac{19}{21}\right)x\frac{2+3-5}{12}\)
=\(=\left(\frac{25}{37}-\frac{17}{19}+\frac{19}{21}\right)x\frac{0}{12}=0\)
191919+191919= 383838
HT
@@@
= 383838