a: \(=\dfrac{3}{22}\cdot22\cdot\dfrac{3}{11}=3\cdot\dfrac{3}{11}=\dfrac{9}{11}\)

b: \(=\dfrac{5}{6}\cdot\dfrac{2}{5}=\dfrac{1}{3}\)

c: =17/21(3/5+2/5)=17/21

3\22*3\11*22

=9\22*11

=9\22

11\22

=9\11

9/11 ca hai cach

=9/11

3/22 x 33/11 x 22= 3/22 x22 x 3=3 x 3=9

3/5 x 17/21 + 17/21 + 2/5= 17/21(3/5 + 2/5)= 17/21x 1=17/21

(1/2+1/3)2/5=1/2x2/5+1/3x2/5 =1/5+2/15=1/3

3/22 x 3/11 x 22=

c1:\(\frac{3\times3\times22}{22\times11}=\frac{9}{11}\)                              c2:\(\frac{9}{242}\times22=\frac{9}{11}\)

( 1/2 + 1/3 ) x 2/5=

c1:\(\frac{5}{6}\times\frac{2}{5}=\frac{1}{3}\)                                    c2:\(\frac{1}{2}\times\frac{2}{5}+\frac{1}{3}\times\frac{2}{5}=\frac{1}{5}+\frac{2}{15}=\frac{1}{3}\)

nhanh lên

a: \(=\dfrac{3}{22}\cdot22\cdot\dfrac{3}{11}=3\cdot\dfrac{3}{11}=\dfrac{9}{11}\)

b: \(=\dfrac{5}{6}\cdot\dfrac{2}{5}=\dfrac{1}{3}\)

c: \(=\dfrac{17}{21}\left(\dfrac{3}{5}+\dfrac{2}{5}\right)=\dfrac{17}{21}\)

a : = \(\dfrac{3}{22}\). 22 . \(\dfrac{3}{11}\) = 3 . \(\dfrac{3}{11}\) = \(\dfrac{9}{11}\)

b : = \(\dfrac{5}{6}\). \(\dfrac{2}{5}\) = \(\dfrac{1}{3}\)

c: = \(\dfrac{17}{21}\)(\(\dfrac{3}{5}\) + \(\dfrac{2}{5}\)   ) = \(\dfrac{17}{21}\)

\(C1:\frac{3}{22}x\frac{3}{11}x22=\frac{9}{242}x22=\frac{9}{11}\)

\(C2:\frac{3}{22}x\frac{3}{11}x22=\frac{3}{22}x22x\frac{3}{11}=3x\frac{3}{11}=\frac{9}{11}\)

học tốt ~~~~

ban giai ho minh

14/15+3/11+1/15+3/11=10/22

=[14/15+1/15]+[3/11+3/11]

=[14/15+1/15]+[3/11*2]

= 1+6/11

=17/11

sai bet!!

=(11+99)+(22+88)+(33+77)+(44+66)+55

=100+100+100+100+55

=400+55

=455

=(11+99)+(22+88)+(33+77)+(44+66)+55

=100+100+100+100+55

=400+55

=455

Hình như các bn làm sai rồi

[11 + 99] + [22 + 88] + [33 + 77] + [44 + 66]

= 110 + 110 + 110 + 110 

=110 x 4

=440

mình nghĩ là như z