`4/6+7/13+17/9+19/13+1/9+14/6`

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

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

`=3+2+2`

`=7`

a: =35/17-18/17-9/5+4/5

=1-1=0

b: =-7/19(3/17+8/11-1)

=7/19*18/187=126/3553

c: =26/15-11/15-17/3-6/13

=1-6/13-17/3

=7/13-17/3=-200/39

  (19/13+7/13)+(14/6+4/6)+(1/9+17/9)

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

=2+3+2

=7

\(\frac{19}{13}+\frac{14}{16}+\frac{1}{9}+\frac{4}{6}+\frac{7}{13}+\frac{17}{9}\)

\(=\left(\frac{19}{13}+\frac{7}{13}\right)+\left(\frac{14}{6}+\frac{4}{6}\right)+\left(\frac{1}{9}+\frac{17}{9}\right)\)

\(=2+3+2\)

\(=7\)

chúc bạn học tootrs nha

19/13 + 14/16 + 1/9 + 4/6 + 7/13 + 17/9

= ( 19/13 + 7/13 ) + ( 14/16 + 4/6 ) + ( 1/9 + 17/9 )

= 26/13 + 37/24 + 18/9

= 2 + 37/24 + 2

=( 2 + 2 ) + 37/24

= 4 + 37/24

= 133/24.

\(\left(\frac{19}{13}+\frac{7}{13}\right)+\left(\frac{1}{9}+\frac{17}{9}\right)+\frac{14}{16}\)

=       \(\frac{16}{13}+\frac{18}{9}+\frac{14}{16}\)

= \(\frac{42}{13}+\frac{14}{16}\)

=        \(\frac{427}{104}\)

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

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

=2 +3 + 2

=7

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