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1:
a: =8/7-5/88=669/616
b: \(=1+\dfrac{2}{9}\cdot\dfrac{3}{7}-\dfrac{10}{7}=1+\dfrac{2}{21}-\dfrac{10}{7}\)
\(=\dfrac{21+2-30}{21}=\dfrac{-7}{21}=\dfrac{-1}{3}\)
c: \(=\dfrac{11}{3}-\dfrac{6}{7}+4=\dfrac{77-18+84}{21}=\dfrac{143}{21}\)
Bài 2:
a: =>9/4-x=5/11*2=10/11
=>x=9/4-10/11=59/44
b: =>2/9:x=19/21
=>x=2/9:19/21=14/57
`4/7+4`
`=4/7+4/1`
`=4/7+28/7`
`=32/7`
__
`3+6/11`
`=33/11+6/11`
`=39/11`
__
`3-5/7`
`=3/1-5/7`
`=21/7-5/7`
`=16/7`
__
`21/9-2`
`=21/9-18/9`
`=3/9`
`=1/3`
__
`15/24+2`
`=15/24+48/24`
`=63/24`
`=21/16`
__
`63/45-20/25`
`=63/45-4/5`
`=63/45-36/45`
`=27/45`
`=9/15`
__
`3/4-2/8`
`=3/4-1/4`
`=2/4`
__
`6/7-5/8`
`=48/56-35/56`
`=13/56`
__
`37/45-5/9`
`=37/45-25/45`
`=12/45`
`=4/15`
__
`46/39-11/13`
`=46/39-33/39`
`=13/39`
`=1/2`
__
`5/12+3/4+1/3`
`=5/12+9/12+4/12`
`=14/12+4/12`
`=18/12`
`=3/2`
__
`1/2+3/7+11/14`
`=7/14+6/14+11/14`
`=13/14+11/14`
`=24/14`
`=12/7`
__
`7/10-(1/5+1/4)`
`=7/10-(4/20+5/20)`
`=7/10-9/20`
`=14/20-9/20`
`=5/20`
`=1/4`
__
`15/4-2/3-3/4`
`=(15/4-3/4)-2/3`
`=12/4-2/3`
`=3-2/3`
`=9/3-2/3`
`=7/3`
\(\dfrac{5}{11}:\dfrac{10}{49}-\dfrac{5}{11}.\dfrac{3}{10}+\dfrac{10}{11}.\dfrac{27}{10}\\ =\dfrac{49}{22}-\dfrac{3}{22}+\dfrac{54}{22}\\ =\dfrac{50}{11}\)
\(\left(11\times5-10\times5-5\right)\times\left(1+2+3+4+....+99\right)\)
\(=\left[5\times\left(11-10-1\right)\right]\times\left(1+2+3+4+...+99\right)\)
\(=\left(5\times0\right)\times\left(1+2+3+4+...+99\right)\)
\(=0\)
(11.5-10.5-5).(1+2+3+4+...+99)
= [5.(11-10-1)].(1+2+3+4+...+99)
= (5.0).(1+2+3+4+...+99)
= 0.(1+2+3+4+...+99)
= 0
* Lưu ý: Dấu (.) là dấu nhân
#hoctot
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\(\dfrac{1}{5}\times\dfrac{10}{11}+\dfrac{2}{11}\)
\(=\dfrac{10}{55}+\dfrac{2}{11}\)
\(=\dfrac{2}{11}+\dfrac{2}{11}\)
\(=\dfrac{4}{11}\)
_HT_