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a, \(\frac{6}{7}.\frac{16}{15}.\frac{7}{6}.\frac{21}{32}=\frac{6}{7}.\frac{7}{6}.\frac{16}{15}.\frac{21}{32}\)=\(1.\frac{16}{15}.\frac{21}{32}=\frac{7}{5.2}=\frac{7}{10}\)
Phần b T2
c,\(\frac{7}{4}.\frac{11}{21}+\frac{11}{21}.\frac{5}{4}=\frac{11}{21}.\left(\frac{7}{4}+\frac{5}{4}\right)\)=\(\frac{11}{21}.3=\frac{11}{7}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{2}{3}.\frac{3}{4}.\frac{4}{5}.\frac{5}{6}:\frac{2}{6}+2019\)
=\(\frac{2}{3}.\frac{3}{4}.\frac{4}{5}.\frac{5}{6}.\frac{6}{2}+2019\)
=\(\frac{2.3.4.5.6}{3.4.5.6.2}+2019\)
=\(1+2019\)
=\(2020\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,\frac{2}{5}+\frac{1}{6}+\frac{3}{5}\)
\(=\left(\frac{2}{5}+\frac{3}{5}\right)+\frac{1}{6}\)
\(=1+\frac{1}{6}\)
\(=\frac{7}{6}\)
Hok tốt!~
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b . 3/7 . 16/33 + 16/33 . 4/7
= 16/33 . ( 3/7 + 4/7 )
= 16/33 . 7/7
= 16/33 . 1
= 16/33
c2 3/7 . 16/33 + 16/33 . 4/7
= 16/77 + 64/231
= 48/231 + 64/231
= 112/231
= 16/33
chúc em học giỏi !!!
a . 5/24 . 5/12 . 24
= ( 5/24 . 24 ) .5/12
= 5 . 5/12
= 25/12
C2 : 5/24 . 5/12 . 24
= 5/24 . ( 5/12 . 24 )
= 5/24 . 10
= 50/24
= 25/12
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{17}{2}\times\frac{3}{5}+\frac{3}{5}\times\frac{1}{2}+\frac{3}{5}\)
\(=\frac{3}{5}\times\left(\frac{17}{2}+\frac{1}{2}\right)\)
\(=\frac{3}{5}\times9\)
\(=\frac{27}{5}\)
Ai Fan anh Kha diem danh
\(\frac{17}{2}\times\frac{3}{5}+\frac{3}{5}\times\frac{1}{2}+\frac{3}{5}\)
\(=\frac{3}{5}\times\left(\frac{17}{2}+\frac{1}{2}+1\right)\)
\(=\frac{3}{5}\times\left(\frac{17}{2}+\frac{1}{2}+\frac{2}{2}\right)\)
\(=\frac{3}{5}\times\frac{20}{2}\)
\(=\frac{60}{10}=6\)
CHÚC BẠN HOK TOT
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,\frac{1}{2\times3}+\frac{1}{3\times4}+\frac{1}{4\times5}+\frac{1}{5\times6}=\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}\)
\(=\frac{1}{2}-\frac{1}{6}=\frac{1}{3}\)
\(b,\left(1-\frac{1}{2}\right)\times\left(1-\frac{1}{3}\right)\times\left(1-\frac{1}{4}\right)=\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\)
\(=\frac{1\times2\times3}{2\times3\times4}=\frac{1}{4}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(1-\frac{1}{2}\right)\cdot\left(1-\frac{1}{3}\right)\cdot\left(1-\frac{1}{4}\right)\cdot\left(1-\frac{1}{5}\right)=\frac{1}{2}\cdot\frac{2}{3}\cdot\frac{3}{4}\cdot\frac{4}{5}=\frac{1\cdot2\cdot3\cdot4}{2\cdot3\cdot4\cdot5}=\frac{1}{5}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a:\(\frac{5}{6}\)-\(\frac{3}{4}\):2
=\(\frac{5}{6}\)-\(\frac{3}{4}\):\(\frac{2}{1}\)
=\(\frac{5}{6}\)-\(\frac{3}{8}\)
=\(\frac{11}{24}\)
a) \(\frac{5}{6}.\frac{3}{4}:2\)= \(\frac{5}{8}x\frac{1}{2}\)= \(\frac{5}{16}\)
b) \(\frac{2}{5}.\frac{4}{7}:2\)= \(\frac{8}{35}x\frac{1}{2}\)= \(\frac{8}{70}\)
Đúng 100%
cái dấu chấm là cái dấu gì vậy???
= 3/5 *(17/2+1/2)
=3/5*9
=27/5