x+50=450-50

x+50=400

x=400-50

x=350

vậy x=350

-__-

x + 50 = 450 - 50

x + 50 = 400

      x  = 400 - 50

      x  = 350                         ai k mk,mk k lại

x + 50 = 450 - 50 

x + 50 = 400

      x   = 400 - 50

      x  = 350

a) 450 – ( 25 – 10) = 450 – 15

                   = 435

450 – 25 – 10 = 425 – 10

                   = 415

b) 180 : 6 : 2 = 30 : 6

                   = 15

180 : ( 6 : 2 ) = 180 : 3

                   = 60

c) 410 – (50 +30) = 410 -80

                   = 330

410 - 50 + 30 = 360 + 30

                   = 390

d) 16 x (6 : 3) = 16 x 2

                   = 32

16 x 6 : 3 = 96 : 3

                   = 32

450 - x = 50

x = 450 - 50

x = 400

Mk nhanh nhất đó 

450 - x = 50 

=> x= 450 - 50 

=> x= 400 

h nha 

thanks

450-x=50

       x=450-50

        x=400

CHÚC BẠN HỌC GIỎI

TK MÌNH NHÉ

x=450-50

x=400

450 - x = 50

x = 450 - 50

x = 400

x=450-50

x=400

450:(x-19)=50

=> x-19=450:50

=> x-19=9

=> x=9+19

Vậy x=28.

450:(x-19)=50

x-19=450:50

x-19=9

x=19+9

x=28

x=28

HOK TOT

(450 x 27) : 50

=(450:50)x27

=9x27

=243

\(\left(450\times27\right):50=\left(450:50\right)\times27=9\times27=243\)

\(\text{( 450 x 27 ) : 50}\)

\(=\text{(450:50) x27}\)

\(\text{=9x27}\)

\(\text{=243}\)

dễ :>>

450 : (50 - 7x) = 30

50 - 7x = 450 : 30

50 - 7x = 15

7x = 50 - 15

7x = 35

x = 35 : 7

x = 5

(450:50) x27=9x27=243

chúc bn hok tốt

(450:50)x27=9x27=243

Chúc bạn làm bài tốt.