a) (370 + 12) : 2 = 382 : 2

                  = 191

370 + 12 : 2 = 370 + 6

                  = 376

b) (231 – 100) x 2 = 131 x 2

                   = 262

231 – 100 x 2 = 231 – 200

                   = 31

c) 14 x 6 : 2 = 84 : 2

                   = 42

14 x (6 : 2) = 14 x 3

                  = 42

d) 900 – 200 – 100 = 700 – 100

                   = 600

900 – (200 – 100) = 900 – 100

                   = 800

9000

100+100+200+200+300+300+400+400+500+500+600+600+700+700+800 = 6400

9000

1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111222222222222222222222222222222223333333333333333333333333333333333333333333333334444444444444444444444444444444444444455555555555555555556666666666666666677777777777777777777777777777777777777777777777778888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888

900000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000213131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313

=9000

\(=\left(100+900\right)+\left(800+200\right)+...+\left(900+100\right)\)(9 cặp)

\(=1000+1000+...+1000\)(9 số 1000)

\(=1000\times9\)

\(=9000\)

k mình nha

111100000000000000000000111110103

x + 200 = 1000

x = 1000 - 200 

x = 800

pk

x=800

tk mk nha!

x +200=1000

    x=1000-200

    x= 800

100 x 6 x 9 x 50 x 200 x 900 x 1000 x 2000 x 900 x 10 = 874800000000000000000

8748e+20(không thể tính được)

= 600 x 450 x 1800 x 2000 000 x 9000 

= 9477 e + 18

x - 100 = 200 + 900

x - 100 = 1100

x         = 1100 + 100

x         = 1200

x + 100 = 300 - 400

x + 100 = - 100

x          = - 100 - 100

x          = - 200

x+100=200+900

x+100=1000

x=1000-100

x=900

x+100=300-400

x+100=-100

x=-100-100

x=-200

X-100=200+900

X-100=1100

X       =1100+100

X       =1200

x + 200 + 300 - 100 = 900

=> không biết

Uung ho nha

x + 200 + 300 - 100 = 900

x + 400 = 900

x = 900 - 400

x = 500

tk mk nha mk sẽ tk lại

x + 200 + 300 - 100 = 900

x + 500 - 100 = 900

x + 400 = 900

x = 900 - 400

x = 500.

x - 100 = 900

x = 900 + 100

x = 1 000.

x + 200 = 500 

x = 500 - 200

x = 300.

x - 100 = 900

      x = 900 + 100

      x = 1000

x + 200 = 500

      x = 500 - 200

      x= 300

k

a, x-100=900                  b, x+200=500

=>x=900+100                 =>x=500-200

=>x=1000                       =>x=300

Vậy x=1000                       Vậy x=300