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1.
a) \(\frac{16}{24}-\frac{1}{3}=\frac{16}{24}-\frac{8}{24}=\)\(\frac{8}{24}=\frac{1}{3}\)
b) \(\frac{4}{5}-\frac{12}{60}=\frac{48}{60}-\frac{12}{60}=\frac{36}{60}=\frac{9}{15}\)
3.
a)\(\frac{17}{6}-\frac{2}{6}=\frac{17-2}{6}=\frac{15}{6}\)
b) \(\frac{16}{15}-\frac{11}{15}=\frac{16-11}{15}=\frac{5}{15}=\frac{1}{3}\)
c) \(\frac{19}{12}-\frac{13}{12}=\frac{19-13}{12}=\frac{6}{12}=\frac{1}{2}\)
a) 16 24 − 1 3 = 16 24 − 8 24 = 24 16 − 3 1 = 24 16 − 24 8 = 8 24 = 1 3 24 8 = 3 1 b) 4 5 − 12 60 = 48 60 − 12 60 = 36 60 = 9 15 5 4 − 60 12 = 60 48 − 60 12 = 60 36 = 15 9 3. a) 17 6 − 2 6 = 17 − 2 6 = 15 6 6 17 − 6 2 = 6 17−2 = 6 15 b) 16 15 − 11 15 = 16 − 11 15 = 5 15 = 1 3 15 16 − 15 11 = 15 16−11 = 15 5 = 3 1 c) 19 12 − 13 12 = 19 − 13 12 = 6 12 = 1 2 12 19 − 12 13 = 12 19−13 = 12 6 = 2 1

\(a,\frac{2}{5}+\frac{1}{6}+\frac{3}{5}\)
\(=\left(\frac{2}{5}+\frac{3}{5}\right)+\frac{1}{6}\)
\(=1+\frac{1}{6}\)
\(=\frac{7}{6}\)
Hok tốt!~

`a, 4/9 + 2/5 + 5/9= (4/9 +5/9) + 2/5= 1 + 2/5= 5/5 + 2/5= 7/5`
`b, 6/13 + 5/8 + 7/13=(6/13 + 7/13) + 5/8=1+5/8= 8/8 + 5/8= 13/8`
`c, 5/11 + 6/25 + 66/121 = ( 5/11 + 66/121 ) + 6/25=1 + 6/25 = 25/25 + 6/25 = 31/25`
`d, 1/2 + 1/3 + 1/4 + 1/6 + 1/12 + 1/24= (1/2 + 1/4) +(1/3 + 1/6) + (1/12 + 1/24)= 3/4 + 1/2 + 1/8= 6/8 + 4/8 + 1/8= 11/8`
`@ yl`

3636/4545+x=4848/1515
x=4848/1515-3636/4545
x=14544/4545-3636/4545
x=10908/4545
3535/5050-x=8/25
x=3535/5050-1616/5050
x=1919/5050

A = \(\frac{1}{3}+\frac{1}{6}+\frac{1}{12}+\frac{1}{24}+...+\frac{1}{192}+\frac{1}{384}\)
A x 2 =(1/2+1/6+1/12+1/24+…+1/192+1/384) x 2
A x 2 = 1 + 2/6 + 2/12 + 2/24 + ... + 2/192 + 2/384
Rút gọn ta được:
A x 2 = 1 + 1/3 + 1/6 + 1/12 + ... + 1/96 + 1/192
A x 2 - A = 1 + 1/3 + 1/6 + 1/12 + ... + 1/96 + 1/192 - (1/2+1/6+1/12+1/24+…+1/192+1/384)
A = 1 + 1/3 - 1/2 - 1/384
A = 5/6 - 1/384
A = 319/384
ĐS: 319/384 .

\(13\frac{1}{4}-2\frac{5}{27}-10\frac{5}{6}\)
\(=\frac{53}{4}-\frac{59}{27}-\frac{65}{6}\)
\(=\frac{25}{108}\)
2 - 13/24 - 1/6 - 1/3
= 48/24 - 13/24 - 4/24 - 8/24
= (48-13-4-8)/(24)
= 23/24
2 - \(\frac{13}{24}\) - \(\frac16\) - \(\frac13\)
= \(\frac{48}{24}\) - \(\frac{13}{24}\) - \(\frac{4}{24}\) - \(\frac{8}{24}\)
= (\(\frac{48}{24}-\frac{8}{24}\)) - (\(\frac{13}{24}+\frac{4}{24}\))
= \(\frac{40}{24}\) - \(\frac{17}{24}\)
= \(\frac{23}{24}\)