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1.Ta có: \(\frac{5}{8}\)= \(\frac{5.5}{8.5}\)= \(\frac{25}{40}\)
\(\frac{4}{5}\)= \(\frac{4.8}{5.8}\)= \(\frac{32}{40}\)
\(\Rightarrow\)Tấm vải 2 dài hơn tấm vải 1
2.\(\frac{7}{9}\)> \(\frac{7}{11}\)
\(\frac{6}{13}\) > \(\frac{12}{28}\)
\(\frac{15}{8}\)< \(\frac{15}{7}\)
\(\frac{35}{63}\)= \(\frac{5}{9}\)
1
\(\text{ta có: }\frac{5}{8}=\frac{5\times5}{8\times5}=\frac{25}{40}\text{ và }\frac{4}{5}=\frac{4\times8}{5\times8}=\frac{32}{40}\)
\(\Rightarrow\frac{5}{8}< \frac{4}{5}\left(\frac{25}{40}< \frac{32}{40}\right)\)
\(\Rightarrow\) mảnh vải đỏ dài hơn
2
7/9 >7/11
6/13 >12/28
15/8 <15/7
35/63 = 5/9
\(\text{# học tốt #}\)
`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`
Câu 1
a)\(\frac{35}{8}\);\(\frac{21}{8}\);\(\frac{13}{13}\);\(\frac{9}{15}\);\(\frac{7}{15}\)
b)\(\frac{35}{8}\);\(\frac{21}{8}\);\(\frac{13}{13}\);\(\frac{9}{15}\);\(\frac{7}{15}\)
c)\(\frac{35}{8}\);\(\frac{21}{8}\);\(\frac{13}{13}\);\(\frac{9}{15}\);\(\frac{7}{15}\)
kết quả =\(\frac{4067}{1287}\)
I'm so sorry but... it's False