34 x 1 125 -25 x 34- 34 x 100

= 38 250 - 850 - 34 000

= 37 400 - 34 000

= 3 000

~HT~

1/4

\(=\dfrac{8}{15}\left(\dfrac{25}{32}-\dfrac{10}{32}\right)=\dfrac{8}{15}\cdot\dfrac{15}{32}=\dfrac{1}{4}\)

( 25/32 - 10/32) x 8/15

 = 15/32 x 8/15

= 1/4

\(\left(25\times32\right)\div4\\ =25\times32\div4\\ =25\times\left(32\div4\right)\\ =25\times8\\ =200\)

`(25 \times 32) \div 4`

`= (25 \times 4 \times 8) \div 4`

`= (100 \times 8) \div 4`

`= 800 \div 4`

`= 200`

b. 2 x 8 x 50 x 25 x 125 = (2 × 50) × (8 × 125) × 25

= 100 × 1000 × 25

= 100000 × 25

= 2500000

= ( 2x50) x ( 8x125) x 25

= 100 x 1000 x 25

100000 x 25

= 2500000

b. 2 x 8 x 50 x 25 x 125 = (2 × 50) × (8 × 125) × 25

= 100 × 1000 × 25

= 100000 × 25

= 2500000

625:125=5

625:(25 x 5)

=625:125

=5

ke me may do hoc giot

   ( 50  x 315 ) : 25

= 50 : 25 x 315

= 2 x 315

= 630 

 (50 x 315) : 25

=15750 : 25

=630

= 50 x 315 : 25

=(50 : 25) x 315

=    2          x 315

= 630

KQ đây nhe b

   3,4 x 210 + 66 x 28,4 + 34 x 2,4 - 6,6 x 50

= (34 x 21 + 34 x 2,4) + (66 x 28,4 - 6,6 x 50)

= 34 x (21 + 2,4) + 6,6 x (284 - 50)

= 34 x 23,4 + 6,6 x 234

= 23,4 x (34 + 66)

= 23,4 x 100

= 2340 

121 x 34 + 11 x 11 x 50 + 121 x 26

= 121 x 34 + 121 x 50 + 121 x 26

= 121 x (34 + 50 + 26)

= 121 x 110

= 13 310

      121 x 34 + 11 x 11 x 50 + 121 x 26

= 121 x ( 34 + 26 ) + 11 x 11 x 50

= 121 x  ( 34 + 26 ) +     121  x 50

= 121 x ( 34 + 26 + 50 )

= 121 x 110

= 13 310

dễ thật đó

698 x 36 - 698 x 25 - 698
= 698 x ( 36 - 25 - 1 )
= 698 x 10 = 6980 
tìm x 
320 : x + 80 : x = 50 
( 320 + 80 ) : 2x = 50 
400 : 2x =50 
         2x = 400 x 50 
         2x = 20000
         2x = 20000 : 2 = 10000

698 x 36 - 698 x 25 - 698
= 698 x ( 36 - 25 - 1 )
= 698 x 10 = 6980 
tìm x 
320 : x + 80 : x = 50 
( 320 + 80 ) : 2x = 50 
400 : 2x =50 
         2x = 400 x 50 
         2x = 20000
         2x = 20000 : 2 = 10000