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a) = 1/2 - 1/2 + 1/3 -1/3 + 1/4 - 1/4 + 1/5 - 1/5 + 1/6
= 0 + 0 + 0 + 0 + 1/6
= 1/6
b) 2/3 + 2/4 - 2/4 + 2/5 - 2/5 + 2/6 - 2/6 + 2/7 - 2/7 + 28
= 2/3 + 28
= 86/3
[tick cho mik nha]
\(\dfrac{6}{7}+\dfrac{5}{8}=\dfrac{48+35}{56}=\dfrac{53}{56}\)
\(\dfrac{3}{5}-58=\dfrac{3-290}{5}=\dfrac{-287}{5}\)
\(\dfrac{1}{4}+\dfrac{5}{6}=\dfrac{6+20}{24}=\dfrac{26}{24}=\dfrac{13}{12}\)
\(\dfrac{4}{9}-\dfrac{1}{6}=\dfrac{24-9}{54}=\dfrac{15}{54}\)
\(\dfrac{6}{7}\) + \(\dfrac{5}{8}\) = \(\dfrac{48}{56}\) + \(\dfrac{35}{56}\) = \(\dfrac{83}{56}\)
\(\dfrac{3}{5}\) - 58 (lớp 4 chưa học số âm xem lại đề )
\(\dfrac{1}{4}\) + \(\dfrac{5}{6}\) = \(\dfrac{3}{12}\) + \(\dfrac{10}{12}\) = \(\dfrac{13}{12}\)
\(\dfrac{4}{9}\) - \(\dfrac{1}{6}\) = \(\dfrac{8}{18}\) - \(\dfrac{3}{18}\) =\(\dfrac{5}{18}\)
a) = 13/12
b) = 5/9
c) = 1/9
d) = 1/12
e) = 11/24
học tốt nha e
`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`
\(\frac{1}{5}+\frac{1}{6}\)
\(=\frac{6}{30}+\frac{5}{30}\)
\(=\frac{11}{30}\)
bằng 11/30