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\(\frac{21}{11}\times\frac{22}{17}:\frac{42}{34}\)
\(=\frac{44}{17}:\frac{42}{34}\)
\(=\frac{44}{21}\)
Hok tốt
\(\frac{21}{11}.\frac{22}{17}\div\frac{42}{34}\)
\(=\frac{21}{11}.\frac{22}{17}.\frac{34}{42}\)
\(=\frac{21.22.34}{11.17.42}\)
\(=\frac{21.11.2.17.2}{11.17.2.21}\)
\(=2\)
=2 nha bạn
nhớ k mình nha
bạn nào 10 sp hoặc trên 10 sp k đúng giúp mình đi ạ
cám ơn
\(\frac{21}{11}.\frac{22}{17}.\frac{68}{63}\)
\(=\frac{42}{17}.\frac{68}{63}\)
\(=\frac{8}{3}\)
\(\frac{22}{17}.\frac{34}{63}.\frac{21}{11}=\frac{11.2.17.2.21}{17.21.3.11}=\frac{2.2}{3}=\frac{4}{3}\)
a)\(\frac{8}{3}\)
b)\(\frac{1}{5}=0,2\)
c)\(\frac{17}{135}\)
d)\(\frac{2}{3}\)
e)\(\frac{5}{2}=2,5\)
b)\(\left(\dfrac{13}{21}\times\dfrac{7}{8}-\dfrac{12}{21}\times\dfrac{7}{8}\right)\times12\)
=\(\left(\dfrac{7}{8}\times\left(\dfrac{13}{21}-\dfrac{12}{21}\right)\right)\times12\)
=\(\left(\dfrac{7}{8}\times\dfrac{1}{21}\right)\times12\)
=\(\dfrac{7}{16}\)
c)\(\dfrac{7}{11}+\dfrac{3}{4}+\dfrac{4}{11}+\dfrac{8}{17}+\dfrac{1}{4}+\dfrac{18}{34}\)
= \(\left(\dfrac{7}{11}+\dfrac{4}{11}\right)+\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\dfrac{8}{17}+\dfrac{9}{17}\)
= 1 + 1 + \(\left(\dfrac{8}{17}+\dfrac{9}{17}\right)\)
= 2 + 1
= 3
\(=\dfrac{21}{11}\cdot\dfrac{22}{17}\cdot\dfrac{34}{42}=\dfrac{1}{2}\cdot2\cdot2=2\)
21/11 x 22/17 : 42/34
= 41/17 : 42/34
= 41/21