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A=\(\dfrac{28}{15}\)(\(\dfrac{1}{2}\))\(^2\).3+(\(\dfrac{8}{15}-\dfrac{79}{60}\)):\(\dfrac{47}{24}\) A=28\(\dfrac{28}{15}.\dfrac{1}{4}.3+\dfrac{\left(-47\right)}{60}.\dfrac{24}{47}\) A=\(\dfrac{7}{5}+\dfrac{\left(-2\right)}{5}=\dfrac{5}{5}=1\) Vậy A=1 
=\(\dfrac{8}{19}.\dfrac{5}{11}+\dfrac{7}{19}.\dfrac{8}{11}-\dfrac{8}{19}.\dfrac{1}{11}\)
=\(\dfrac{8}{19}.\dfrac{5}{11}+\dfrac{8}{19}.\dfrac{7}{11}-\dfrac{8}{19}.\dfrac{1}{11}\)
=\(\dfrac{8}{19}.\left(\dfrac{5}{11}+\dfrac{7}{11}-\dfrac{1}{11}\right)\)
=\(\dfrac{8}{19}\).1
=\(\dfrac{8}{19}\)
kí hiệu /:phần,kí hiệu'."nhân
a)5/4-5/8+-2/3=30/24+15/24+(-16/24)=29/24
b)7/19.8/11+7/19.3/11+12/19
=7/19.(8/11+3/11)+12/19
=7/19.11/11+12/19
=7/19.1+12/19
=7/19+2/19=9/19
chúc học tốt!
\(\dfrac{19}{\dfrac{5}{8}}:\dfrac{7}{2013}-\dfrac{26}{\dfrac{5}{8}}:\dfrac{7}{2013}\)
=\(\dfrac{152}{5}:\dfrac{7}{2013}-\dfrac{13}{20}:\dfrac{7}{2013}\)
=(\(\dfrac{152}{5}-\dfrac{13}{20}\)):\(\dfrac{7}{2013}\)
=(\(\dfrac{608}{20}-\dfrac{13}{20}\)):\(\dfrac{7}{2013}\)
=\(\dfrac{595}{20}:\dfrac{7}{2013}\)
=\(\dfrac{1197735}{40260}:\dfrac{140}{40260}\)
=\(\dfrac{119773}{140}\)
Mình ko chắc cách này đc ko nữa bạn tham khảo thôi nhé. Chúc may mắn.