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`1/3 + 5/4`
`= 4/12 + 15/12`
`= 19/12
__
`4/12 - 1/15`
`= 1/3 -1/15`
`= 5/15 -1/15`
`=4/15`
__
`2/3 xx 15/8`
`= (2xx15)/(3xx88)`
`= 30/24`
`=5/4`
__
`2/3 : 8/21`
`= 2/3 xx 21/8`
`= (2xx21)/(3xx8)`
`= 42/24`
`=7/4`
1/3+5/4=4/12+15/12
=19/12
4/12-1/15=20/60-4/60
=16/60=4/15
2/3x15/8=30/24=5/4
2/3:8/21=42/24=7/4
nhớ cho a tích nhé =)) a bị bịp nhiều rồi
\(=\frac{11}{12}\times\frac{24}{7}\times\frac{21}{22}\)
\(=\frac{22}{7}\times\frac{22}{21}\)
\(=\frac{21}{7}\)
`5/2 - 2/3 + 5/4`
`= 30/12 - 8/12 + 15/12`
`= (30-8+15)/12`
`= 37/12`
`----`
`20/12 + 36/18 -21/28`
`= 5/3 + 2-3/4`
`= 20/12 + 24/12 -9/12`
`= 35/12`
a: \(=\dfrac{21}{11}+\dfrac{12}{11}+\left(-\dfrac{9}{19}-\dfrac{3}{19}-\dfrac{6}{19}\right)=3-\dfrac{18}{19}=\dfrac{39}{19}\)
b: \(=\dfrac{2}{3}+\dfrac{4}{3}+\dfrac{3}{4}+\dfrac{7}{4}+\dfrac{4}{5}+\dfrac{16}{5}=2+4+\dfrac{5}{2}=6+\dfrac{5}{2}=\dfrac{17}{2}\)
a, \(\frac{2}{3}\)x \(\frac{10}{21}\)x \(\frac{3}{2}\)= \(\frac{2x10x3}{3x21x2}\) = \(\frac{10}{21}\)
b, \(\frac{22}{5}\)x \(12\)x\(\frac{5}{22}\) = \(\frac{22x12x5}{5x22}\) = \(12\)
\(\frac{7}{9}+\frac{6}{7}\times\frac{4}{5}=\frac{7}{9}+\frac{24}{35}=\frac{361}{315}\)
\(\frac{21}{23}+\frac{4}{5}:\frac{6}{8}=\frac{21}{23}+\frac{16}{15}=\frac{548}{345}\)
\(\frac{5}{8}\times\frac{4}{9}:\frac{2}{3}=\frac{5}{18}:\frac{2}{3}=\frac{5}{12}\)
\(\frac{7}{12}+\frac{5}{6}-\frac{21}{24}=\frac{14}{24}+\frac{20}{24}-\frac{21}{24}=\frac{11}{24}\)
b,
\(\frac{21}{23}+\frac{4}{5}:\frac{6}{8}=\frac{21}{23}+\frac{4}{5}.\frac{8}{6}=\frac{21}{23}+\frac{16}{15}=1\frac{338}{345}\)
c,
\(\frac{5}{8}.\frac{4}{9}.\frac{3}{2}=\frac{5}{12}\)
d,
\(\frac{7}{12}+\frac{5}{6}-\frac{21}{24}=\frac{14}{24}+\frac{20}{24}-\frac{21}{24}=\frac{13}{24}\)
chán thật
12 21 + 2 = 12 21 + 42 21 = 54 21 = 18 7