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TL:
\(\frac{12}{100}\)= 0,12
\(\frac{5}{100}\)= 0,05
\(\frac{306}{1000}\)= 0,306
-HT-
`#3107`
`7/13 \div x = 14/39`
`=> x = 7/13 \div 14/39`
`=> x = 3/2`
Vậy, `x = 3/2`
________
`x \times 3/5 = 14/15`
`=> x = 14/15 \div 3/5`
`=> x = 14/9`
Vậy, `x=14/9.`
\(\dfrac{7}{13}:x=\dfrac{14}{39}\)
\(x=\dfrac{7}{13}:\dfrac{14}{39}\)
\(x=\dfrac{7}{13}\times\dfrac{39}{14}\)
\(x=\dfrac{3}{2}\)
___
\(x\times\dfrac{3}{5}=\dfrac{14}{15}\)
\(x=\dfrac{14}{15}:\dfrac{3}{5}\)
\(x=\dfrac{14}{15}\times\dfrac{5}{3}\)
\(x=\dfrac{14}{9}\)
=13/12x14/13x15/14x16/15x...x2006/2005x2007/2006x2008/2007
=2008/12
=502/3
A = 1\(\dfrac{1}{12}\) \(\times\) 1\(\dfrac{1}{13}\) \(\times\) 1\(\dfrac{1}{14}\) \(\times\) 1\(\dfrac{1}{15}\) \(\times\) ... \(\times\) 1\(\dfrac{1}{2005}\) \(\times\) 1\(\dfrac{1}{2006}\) \(\times\) 1\(\dfrac{1}{2007}\)
A = ( 1 + \(\dfrac{1}{12}\)) \(\times\) ( 1 + \(\dfrac{1}{13}\)) \(\times\) ( 1 + \(\dfrac{1}{14}\)) \(\times\)...\(\times\) ( 1 + \(\dfrac{1}{2006}\))\(\times\)(1+\(\dfrac{1}{2007}\))
A = \(\dfrac{13}{12}\) \(\times\) \(\dfrac{14}{13}\) \(\times\) \(\dfrac{15}{14}\) \(\times\) ...\(\times\) \(\dfrac{2007}{2006}\) \(\times\) \(\dfrac{2008}{2007}\)
A = \(\dfrac{13\times14\times15\times...\times2007}{13\times14\times15\times...\times2007}\) \(\times\) \(\dfrac{2008}{12}\)
A = 1 \(\times\) \(\dfrac{502}{3}\)
A = \(\dfrac{502}{3}\)
Gọi số đó là a
Ta có:
\(\frac{17+a}{39}=\frac{2}{3}\)
\(\Rightarrow\left(17+a\right).3=39.2\)
\(\Rightarrow17+a=\frac{39.2}{3}\)
\(\Rightarrow17+a=26\)
\(\Rightarrow a=9\)
Theo bài ta có 39+x/69+x =3/5
=>(39+x).5 = (69+x). 3
=> 195+5x = 207+3x
=>5x = 207 +3x -195=12+3x
=>5x - 3x= 12
=>2x = 12=>x =6
Ta có : \(\frac{3}{4}< 1\)
\(\frac{9}{14}< 1\)
\(\frac{19}{17}>1\)
\(\frac{23}{23}=1\)
Vậy phân số lớn hơn 1 là \(\frac{19}{17}\)
Ta co: 3/4 < 1
9/14 < 1
19/17 > 1
23/23 = 1
*Nen suy ra phan so 19/17 lon hon 1.
\(\dfrac{39}{14}\)
phân số là 39/14 bạn cho mình 1 chữ đúng nhé