52,3 x 67 + 52,3 x 32 + 52,3 x 1 

= 52,3 x ( 67 + 32 + 1 ) 

= 52,3 x 100 

=  5230 

=52,3 * (67 + 2 * 16 + 1 )

=52,3 * 100

=5230

cảm ơn bạn

2 x 25 x 50 x 4

= ( 2 x 50 ) x ( 25 x 4 )

= 100 x 100

= 10000

2 . 25 . 50 . 4 = ( 2 . 50 ) . ( 25 . 4 ) = 100 . 100 = 10 000 

2 nhân 25 nhân 50 nhân 4 = 10 000

\(\frac{1}{2}\cdot\frac{18}{14}+\frac{1}{2}\cdot\frac{3}{14}-\frac{1}{2}\cdot\frac{7}{14}\)

\(=\frac{1}{2}\left(\frac{18}{14}+\frac{3}{14}-\frac{7}{14}\right)\)

\(=\frac{1}{2}\cdot1=\frac{1}{2}\)

a) 16 x 8 + 12 x 6    

= 4 x 4 x 8 + 4 x 3 x 6

= 4 x 32 + 4 x 18

= 4 x ( 32 + 18 )

= 4 x 50

= 200             

b) 16 x 7 + 14 x 2        

= 8 x 2 x 7 + 14 x 2

= 8 x 14 + 14 x 2

= ( 8 + 2 ) x 14

= 10 x 14

= 140

c) 8 x 12 - 96

= 8 x 12 - 12 x 8

= 0

a / 16 x 8 + 12 x 6

= ( 8 x 2 ) x ( 8 x 1 ) + ( 6 x 2 ) x ( 6x1 )

= 8 x ( 2 x 1 )     + 6 x ( 2 x 1 )

= 8 x 2 + 6 x 2

= 2 x ( 8 + 6 )

= 2 x 14

= 28

b / 16 x 7 + 14 x 2

= 16 x 7 + ( 7 x 2 ) x2

= 16 x 7 + 7 x 2 x 2

= 7 x ( 16 + 2 ) x 2

= 7 x 18 x2

= 7 x ( 6 x 3 ) x2

= 7 x6 x3 x2

= 7 x 6 x ( 3 x 2 )

= 7 x 6 x6 

= ( 7 x 6 ) x ( 6 x 1 )

= 6 x ( 7 x 1 )

= 6 x 7

= 42

c / 8 x 12 - 96

= ( 8 x 12 ) - 96

= 96 - 96

= 0

tớ k chắc cho lắm

đề bài thiếu ak

sai dê r

8/5

686/65

5/7

3/5+7/12+5/12

=3/5+(7/12+5/12)

=3/5+1

=8/5

a.3/5+1=8/5

b.4/26+52/5=686/65

c.(9/16+7/16)*5/7=1*5/7=5/7

a) 52 x 2 + 48 x 2

   = (52 + 48) x 2

   =     100 x 2

   = 200

b) 10 + 12 + 14 + 16 + 18 + 20

   = (12 + 18) + (14 + 16) + (20 + 10)

   =       30     +     30      +      30

   =          90

100

90

200

90

278 nha bạn

kb nhé

kb luôn nhé

464:4+81×2

=116+162=278