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`1)1/2:2/3 .... 2/3 : 1/2`
`=>1/2xx3/2 .... 2/3xx2`
`=>3/4 .... 4/3`
Vì `3/4 < 1` và `4/3>1`
`=>3/4<4/3`
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`4/7:2/5 ... 4/7 : 3/5`
`=>4/7xx5/2....4/7xx5/3`
`=>20/14...20/21`
`=>10/7...20/21`
Vì `10/7>1` và `20/21<1`
`=>10/7>20/21`
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`4/15:4/7....2/5xx10/3`
`=>4/15xx7/4...20/15`
`=>7/15...20/15`
Vì `7<20` nên `7/15<20/15`
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`5/6...15/18-11/18`
`=>5/6...4/18`
Ta có : MSC : `18`
`5/6 = 15/18`
Vì `15>4` nên `5/6 > 4/18`
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12/13 + 2/7 + 8/13 + 6/13 + 5/7
= ( 2/7 + 5/7 ) + ( 12/13 + 8/13 + 6/13 )
= 1 + 2
= 3
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Ai rảnh mà làm hộ mày, ngu như con chó mới không biết làm
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a, 120 x 3 < 120 x 4
b, 18: (2 x 3)= 18:6=3 = 18:2:3=9:3=3
c, 120:3 > 120:4
d, 14 x 8= 112 = 7 x 16 = 112
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\(\dfrac{7}{6}\) + \(\dfrac{5}{12}\) - \(\dfrac{1}{18}\) - 1
= \(\dfrac{42}{36}\) + \(\dfrac{15}{36}\) - \(\dfrac{2}{36}\) - \(\dfrac{36}{36}\)
= \(\dfrac{19}{36}\)
\(\dfrac{13}{6}\) + \(\dfrac{5}{18}+3-\dfrac{7}{12}\)
= \(\dfrac{78}{36}+\dfrac{10}{36}+\dfrac{108}{36}-\dfrac{21}{36}\)
= \(\dfrac{175}{36}\)
3 + \(\dfrac{11}{4}-\dfrac{1}{12}-\dfrac{3}{16}\)
= \(\dfrac{144}{48}+\dfrac{132}{48}-\dfrac{4}{48}-\dfrac{9}{48}\)
= \(\dfrac{263}{48}\)
\(\dfrac{2}{5}\) x \(\dfrac{7}{4}\) - \(\dfrac{2}{5}\) x \(\dfrac{3}{4}\)
= \(\dfrac{2}{5}\) x ( \(\dfrac{7}{4}\) - \(\dfrac{3}{4}\))
= \(\dfrac{2}{5}\) x \(\dfrac{4}{4}\)
= \(\dfrac{2}{5}\)
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\(\dfrac{2}{7}\) \(\times\) \(\dfrac{9}{7}\) - \(\dfrac{18}{49}\) \(\times\) \(\dfrac{1}{2}\)
= \(\dfrac{18}{49}\) - \(\dfrac{18}{49}\) \(\times\) \(\dfrac{1}{2}\)
= \(\dfrac{18}{49}\) \(\times\) 1 - \(\dfrac{18}{49}\) \(\times\) \(\dfrac{1}{2}\)
= \(\dfrac{18}{49}\) \(\times\) ( 1 - \(\dfrac{1}{2}\) )
= \(\dfrac{18}{49}\) \(\times\) \(\dfrac{1}{2}\)
= \(\dfrac{18}{98}\)
= \(\dfrac{9}{49}\)