a) \(250 + 250 × 2 = 250 + 500 = 750 \\ (250 + 250) × 2 = 500 × 2 = 1 000\)

b)\( 750 – 50 × 5 = 750 – 250 = 500\\ (750 – 50) × 5 = 700 × 5 = 3 500\)
c) \(210 × 4 – 4 × 210 = 840 – 840 = 0\\ 3 × (270 : 9) × 0 = 0\)

a) 86 – 16 = 70 

b) 23 x 2 – 1 = 23 

c) 250 : 5 + 5 = 25 

d) 40 + 80 : 4 = 30 

e) 80 + 4 : 2 = 42 

f) 70 + 30 : 2 = 50 

g) 90 + 30 x 3 = 180 

h) 70 + 30 : 2 = 85 

 250 x 15 + 250 x 50 + 250 x 35.

= 250 x ( 15 + 50 + 35 ).

= 250 x 100

= 25000.

k mik nha!!

#Học tốt.

\(250\times15+250\times50+250\times35\)

\(=250\times\left(15+50+35\right)\)

\(=250\times100\)

\(=25000\)

 #hoktot<3#

Ta có:

      \(250\times15+250\times50+250\times35\)

\(=250\times\left(15+50+35\right)\)

\(=250\times100\)

\(=25000\)

 250 + 90 x 10 x 9

= 250 + 900 x 9

= 250 + 8100

= 8350

250+90x10x9

=250+900x9

=250+8100

=8350

=250 + ( 90 * 10 * 9 )

= 250 + 8100

= 8350

x=250-50

x=200

x + 50 = 250

x         = 250 - 50

x         = 200

x+50=250

x=250-50

x=200

x = 250 : 50

x = 5

tk mk nha

x * 50 = 250

x        = 250 : 50

x        = 5

k mình bạn nha!

X  x  50  =  250

         x   =  250  :  50

         x   =     5

Happy new year ! Chúc bạn lun vui vẻ nhé !

x+50=610

x=610-50

x=560

x + 50 = 250 + 360

x + 50 = 610

x        = 610 - 50

x        = 560

x + 50 = 250 + 360

x + 50 = 610

x = 610 - 50

x = 560

( x - 25) x 17 = 34

=> x - 25 = 34 : 17

     x - 25 = 2

=> x = 2 + 25

     x = 27

145 + (150 - x) = 250

=> 150 - x = 250 - 145

     150 - x = 105

=> x = 150 - 105

     x = 45

(2x - 7) x 81 = 0

=> 2x - 7 = 0 : 81

    2x - 7 = 0

  => 2x = 7

   => x = 7 : 2 = 3,5

x - 90 : 15  = 32

=> x - 6 = 32

=> x = 32 + 6

    x = 38

520 - (x - 5) = 250 : 5

 => 520 - (x - 5) = 50

=> x - 5 = 520 - 50

   x - 5 = 470

=> x = 470 + 5

    x = 475

t i c k nhé!! 346457567684786896789

a ) \(\left(x-5\right).17=34\)

=> \(x-5=2\)

=> \(x=7\)

b ) \(145+\left(150-x\right)=250\)

=> \(150-x=105\)

=> \(x=150-105\)

=> \(x=45\)

c ) \(\left(2.x-7\right).81=0\)

=> \(2x-7=0\)

=> \(2x=7\)

=> \(x=\frac{7}{2}\)

d ) \(x-90:15=32\)

=> \(x-6=32\)

=> \(x=38\)

Mấy cái dấu chấm đó là nhân đó nhé