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

26/13 + 18/6 + 9/9

=2+3+1

=6

26/13 + 18/6 + 9/9

=2+3+1

=6

\(\dfrac{4}{6}+\dfrac{7}{13}+\dfrac{17}{9}+\dfrac{19}{13}-\dfrac{8}{9}+\dfrac{14}{6}=\left(\dfrac{4}{6}+\dfrac{14}{6}\right)+\left(\dfrac{7}{13}+\dfrac{19}{13}\right)+\left(\dfrac{17}{9}-\dfrac{8}{9}\right)=3+2+1=6\)

Một mảnh đất HCN có chiều dài 90cm chiều rộng bằng 3/5 chiều dài. Tính chu vi mảnh vườn đó

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

ta co 4/6+14/6+7/13+19/13+17/9+1/9

=3+2+2

=7

nhé bạn ok bye

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

\(=2+3+2\)

\(=7\)

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

=2+3+2

=7

`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`

=19/13 + 7/8 + 1/9 + 2/3 + 7/13 + 17/19

=6221/1368

\(\frac{19}{13}+\frac{14}{16}+\frac{1}{9}+\frac{4}{6}+\frac{7}{13}+\frac{17}{19}=\frac{6221}{1368}\)