12/34 + 14/34
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Bài 1 : Các số đó là : \(\frac{35}{60};\frac{46}{60}\)
Bài 2 :
\(\frac{12}{30}=\frac{12:6}{30:6}=\frac{2}{5}\); \(\frac{20}{45}=\frac{20:5}{45:5}=\frac{4}{9}\)
\(\frac{28}{70}=\frac{28:14}{70:14}=\frac{2}{5}\) ; \(\frac{34}{51}=\frac{34:17}{51:17}=\frac{2}{3}\)
$#Shả$
`A)=5/17xx(15/34+19/34)`
`=5/17xx1=5/17`
`B)=(13/12+7/12)+1/3`
`=5/3+1/3=2`
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Vì:
\(\dfrac{12}{20}=\dfrac{12:4}{20:4}=\dfrac{3}{5}\)
\(\dfrac{12}{14}=\dfrac{12:2}{14:2}=\dfrac{6}{7}\)
\(\dfrac{18}{21}=\dfrac{18:3}{21:3}=\dfrac{6}{7}\)
\(\dfrac{60}{100}=\dfrac{60:20}{100:20}=\dfrac{3}{5}\)
Vậy \(\dfrac{3}{5}=\dfrac{12}{20}=\dfrac{60}{100}\) ; \(\dfrac{6}{7}=\dfrac{12}{14}=\dfrac{18}{21}\)
\(#Wendy.Dang\)

=26/34
=26/34
= 13/17