a,=3/13.17/29.29/34

=3/13.1/2

=3/26

b,=(4/21+25/42).19/33

=11/14.19/33

=19/42

`a, = 3/13 xx (17/29 xx 29/34)`

`= 3/13 xx 1/2`

`= 3/26`.

`b, = 19/33(4/21 + 25/42)`

`= 19/33 xx ( 33/42 )`

`= 19/42`

`a)(3/13xx17/29)xx29/34=3/13xx17/29xx29/34=[3xx17xx29]/[13xx19xx17xx2]=3/26`

`b)4/21xx19/33+25/42xx19/33=19/33xx(4/21+25/42)=19/33xx(8/42+25/42)=19/33xx33/42=19/42`

21/29

= 21/29 x (2/7 + 5/7)

= 21/29 x 1

= 21/29

= 21/29 x (2/7 + 5/7)

= 21/29 x 1

= 21/29

\(=72\times\left(32+29+39\right)\\ =72\times100\\ =7200\)

=7200

 72 x 32 + 72 x 29 + 72 x 39

=72×(32+29+39)

=72×100

=7200

313×1729)×2934(313×1729)×2934

=313×1729×2934=313×1729×2934

=3×17×2913×29×34=3×17×2913×29×34

=3×17×2913×29×2×17=3×17×2913×29×2×17

=313×2=313×2

=326=326

421×1933+2542×1933421×1933+2542×1933

=1933×(421+2542)=1933×(421+2542)

=1933×(842+25

29x5 + 29x3 +29x2

= 29x(5+3+2)

= 29x10

= 290

ai giúp k

   29 x ( 5 + 3 + 2 + 1 )

= 29 x 11 

= 319

\(=537\times\left(39-29\right)\)

\(=537\times10\)

\(=5370\)

537 x 39 - 537 x 29 

= 537 x ( 39 - 29 )

= 537 x 10

= 5370

537 x 39 - 537 x 29 

= 537 x ( 39 - 29 )

= 537 x 10

= 5370

= ( 21 + 29) + ( 23 + 27 )

= 50 + 50

= 100

=(21+29)+(23+27)

=50+50

=100

ai k mình mình k lại cho

21+23+29+27

= (21+29)+(23+27)

= 50+50

= 100

376 x 29 + 70 x 376 + 376

= 376 x 29 + 70 x 376 + 376 x 1

= 376 x (29 + 70 + 1)

= 376 x 100

= 37600

Sửa đề:

376 × 29  + 70 × 376 + 376

= 376 × (29 + 70 + 1)

= 376 × 100

= 37600

= 376 x 29 + 70 x 376 + 376 x 1

= 376 x { 29 + 70 + 1 }

= 376 x 100

= 37600