tính = cách thuận tiện nhất 35/17:35/19-18/17:35/19
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`9/14+19/18+19/14+35/18`
`=(9/14+19/14)+(19/18+35/18)`
`=28/14+54/18`
`=2+3`
`=5`
\(\dfrac{9}{14}+\dfrac{19}{18}+\dfrac{19}{14}+\dfrac{35}{18}=\left(\dfrac{9}{14}+\dfrac{19}{14}\right)+\left(\dfrac{19}{18}+\dfrac{35}{18}\right)=\dfrac{28}{14}+\dfrac{54}{18}=2+3=5\)
a) 81 + 35 + 19 = (81 + 19) + 35
= 100 + 35
= 135
b) 78 + 65 + 135 + 22 = (78 + 22) + (65 + 135)
= 100 + 200
= 300
\(a,\dfrac{13}{19}+\dfrac{18}{19}+\dfrac{17}{19}=\dfrac{13+18+17}{19}=\dfrac{48}{19}\\ b,\dfrac{3}{5}+\dfrac{3}{16}+\dfrac{13}{16}=\dfrac{3}{5}+\left(\dfrac{3}{16}+\dfrac{13}{16}\right)=\dfrac{3}{5}+\dfrac{16}{16}=\dfrac{3}{5}+1=\dfrac{3}{5}+\dfrac{5}{5}=\dfrac{8}{5}\)
\(a\dfrac{13+18+17}{19}=\dfrac{48}{19}\)
\(b\dfrac{3}{5}+\dfrac{3+13}{16}=\dfrac{3}{5}+1=\dfrac{3}{5}+\dfrac{5}{5}=\dfrac{8}{5}\)
TL:
\(358x46+358x35+358x19\)
\(=358x\left(46+35+19\right)\)
\(=358x100\)
\(=35800\)
_HT_
@@@@
145/2014 x 35/54 + 145/2014x 19/54
= 145/2014 x ( 35/54 + 19/54 )
= 145/2014 x 1
= 145/2014
Chúc Bn hok tốt :3
\(\frac{47}{53}\div\frac{17}{52}-\frac{47}{53}\times\frac{35}{17}\)
\(=\frac{47}{53}\times\frac{52}{17}-\frac{47}{53}\times\frac{35}{17}\)
\(=\frac{47}{53}\times(\frac{52}{17}-\frac{35}{17)}\)
\(=\frac{47}{53}\times\frac{17}{17}=\frac{47}{53}\times1=\frac{47}{53}\)