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a: \(=\dfrac{5}{14}\left(\dfrac{2}{9}+\dfrac{7}{9}+1\right)=\dfrac{5}{14}\cdot2=\dfrac{5}{7}\)
b: \(=\dfrac{6}{8}\left(\dfrac{6}{7}-6\right)=\dfrac{6}{8}\cdot\dfrac{-36}{7}=\dfrac{-216}{56}=\dfrac{-27}{7}\)
a, \(\frac{7}{5}+\frac{9}{7}+\frac{6}{5}+\frac{11}{7}\)
C1: \(\frac{94}{35}+\frac{6}{5}+\frac{11}{7}=\frac{136}{35}+\frac{11}{7}=5\frac{16}{35}\)
C2: \(=\left(\frac{7}{5}+\frac{6}{5}\right)+\left(\frac{9}{7}+\frac{11}{7}\right)=\frac{13}{5}+\frac{20}{7}=5\frac{16}{35}\)
b,
C1 : \(\frac{8}{14}+\frac{2}{11}+\frac{12}{14}+\frac{31}{11}=\frac{4}{7}+\frac{2}{11}+\frac{6}{7}+\frac{31}{11}=\frac{58}{77}+\frac{6}{7}+\frac{31}{11}=\frac{124}{77}+\frac{31}{11}=4\frac{3}{7}\)
C2:
\(\frac{4}{7}+\frac{2}{11}+\frac{6}{7}+\frac{31}{11}=\left(\frac{4}{7}+\frac{6}{7}\right)+\left(\frac{2}{11}+\frac{31}{11}\right)=\frac{10}{7}+3=3\frac{10}{7}=4\frac{3}{7}\)
**** cko t nha , xin xin đó
7/8:2=7/8*1/2=7/16
9/11:3=9/11*1/3=9/33=3/11
6:3/7=6/1*7/3=42/3=14
14:21/5=14/1*5/21==70/21
\(\frac{7}{8}:2=\frac{7}{8}.\frac{1}{2}=\frac{7}{16}\)
\(\frac{9}{11}:3=\frac{9}{11}.\frac{1}{3}=\frac{9}{33}=\frac{3}{11}\)
\(6:\frac{3}{7}=6.\frac{7}{3}=14\)
\(14:\frac{21}{5}=14.\frac{5}{21}=\frac{70}{21}\)
****
a) \(\dfrac{5}{9}< \dfrac{7}{9}\)
b) \(\dfrac{7}{6}>\dfrac{6}{6}\)
c) \(\dfrac{3}{14}< \dfrac{5}{14}\)
d) \(\dfrac{5}{8}< \dfrac{9}{8}\)
7*6*8*9*10/10*2*9*2*8*2*7*2*6*2
=7*6*8*9*10/7*6*8*9*10*2*2*2*2*2
=1/2*5
1/10
nếu đúng thì k nha
a ) \(13-\frac{2}{7}\)x \(\frac{14}{6}\)= \(\frac{37}{3}\)= 12,3333333333...
b ) \(\frac{8}{5}\)x \(\frac{2}{6}\)- \(\frac{5}{10}\)= \(\frac{1}{30}\)= 0,033333....
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