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Bài làm
\(\frac{10-1\frac{1}{6}\times\frac{6}{7}}{21:\frac{11}{2}+5\frac{2}{12}}\)
\(=\frac{10-\frac{7}{6}\times\frac{6}{7}}{21\times\frac{2}{11}+\frac{62}{12}}\)
\(=\frac{10-1}{\frac{42}{11}+\frac{62}{12}}\)
\(=9:(\frac{42}{11}+\frac{62}{12})\)
\(=9:\left(\frac{504}{132}+\frac{682}{132}\right)\)
\(=9:\frac{1186}{132}\)
\(=9:\frac{593}{66}\)
\(=9\times\frac{66}{593}\)
\(=\frac{594}{593}\)
# Hông bt có đúng k nx. #
![](https://rs.olm.vn/images/avt/0.png?1311)
Câu b:
\(\frac{21}{8}:\frac{5}{6}+\frac{1}{2}:\frac{5}{6}\)
= \(\frac{63}{20}+\frac{3}{5}\)
= \(\frac{15}{4}\)
\(\left(\frac{21}{8}+\frac{1}{2}\right):\frac{5}{6}\)
\(\frac{25}{8}:\frac{5}{6}\)
\(\frac{25}{8}.\frac{6}{5}\)
\(\frac{30}{8}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1.
a) 5/8 x 4/10 + 2/3 =
= 1/4+ 2/3 = 11/12
b)5/12 x 4/7+5/12 x3/7
=5/12 x (4/7 +3/7)
=5/12 x1 = 5/12
c)(4/5 + 3/10 - 1/5 ) x 6 : 4/7
= ( 8/10 + 3/10 + 2/10) x 6 x 7/4
=13/10 x 21/2
=273/20
2.
5/8 và 3/2
ta có 5/8 =10/16 ; 3/2 =24 /16
vì 24 /16 >10 /16 nên 3/2 > 5/8
b. tương tự như câu a nha
c 418/417 và 925 /926
418/417 > 1 ; 925 /926 < 1
vì 418 /417 >1 mà 925/926 < 1 nên 418 / 417 > 925 /926
chúc bạn học tốt nha !
![](https://rs.olm.vn/images/avt/0.png?1311)
a= (\(\frac{2}{5}\)+\(\frac{2}{9}\)+\(\frac{2}{11}\)\(\times\)\(\frac{5}{7}\)\(+\frac{7}{9}\)\(+\frac{7}{11}\)\()\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(14.\frac{5}{21}=\frac{14}{1}.\frac{5}{21}=\frac{14.5}{21}=\frac{10}{3}\)
\(\frac{5}{21}.14=\frac{5.14}{21.1}=\frac{5.2}{3.1}=\frac{10}{3}\)
\(10:\frac{5}{3}=10.\frac{3}{5}=\frac{10.3}{5}=2.3=6\)
\(\frac{5}{3}:10=\frac{5}{3}.\frac{1}{10}=\frac{5}{3.10}=\frac{1}{6}\)