14/6 + 1/9 + 19/13 + 17/9 + 7/13 + 4/6 = (14/6 + 4/6) + (1/9 + 17/9) + (19/13 + 7/13)

                                                            = 18/6 + 18/9 + 26/13

                                                             = 3 + 2 + 2

                                                               = 7 

a)Các ước của 3 là :3, 1, -3, -1

b)A=(-9).36+(-9).19+(-9).45

     =(-9).(36+45+19)

    =(-9).100=-900

a,Ư=\(_{\left(3\right)}\){1;3}

b,A=(-9).36+(-9).19+(-9).45

A= -9.(36+19+45)

A=-9.100

A=-900

= 13/30

a) 6 000 × 5 : 3 = 30 000 : 3

= 10 000

b) 13 206 × (36 : 9) = 13 206 × 4

= 52 824

\(G=\dfrac{9}{8}+\dfrac{23}{24}+\dfrac{1}{8}+\dfrac{17}{24}+\dfrac{13}{8}+\dfrac{19}{24}\\ \Rightarrow G=\left(\dfrac{9}{8}+\dfrac{1}{8}+\dfrac{13}{8}\right)+\left(\dfrac{23}{24}+\dfrac{17}{24}+\dfrac{19}{24}\right)\\ \Rightarrow G=\dfrac{23}{8}+\dfrac{59}{24}\\ \Rightarrow G=\dfrac{69}{24}+\dfrac{59}{24}\\ \Rightarrow G=\dfrac{128}{24}\\ \Rightarrow G=\dfrac{16}{3}\)

\(=\left(\dfrac{9}{8}+\dfrac{1}{8}+\dfrac{13}{8}\right)+\left(\dfrac{23}{24}+\dfrac{17}{24}+\dfrac{19}{24}\right)\)

\(=\dfrac{23}{8}+\dfrac{59}{24}\)

\(=\dfrac{16}{3}\)

\(3\times9+19\times3+3\times9+9\)
\(=3\times\left(9+19\right)+9\times\left(3+1\right)\)
\(=3\times28+9\times4\)
\(=84+36\)
\(=120\)
#DatNe

    3 \(\times\) 9 + 19 \(\times\) 3 + 3 \(\times\) 9 + 9

= 3 \(\times\) 9 + 3 \(\times\)19 + 3 \(\times\) 9 + 3 \(\times\) 3

= 3 \(\times\) ( 9 + 19 + 9 + 3)

= 3 \(\times\) 40

= 120