9000

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

\(100+200+800+500\times851+10000:100\)

\(=300+800+425500+100\)

\(=1100+425500+100\)

\(=1200+425500\)

\(=426700\)

100+200+800+500x851+10000:100= 100 + 200 + 800 +425500 + 100 = 426700

x - 100 = 800 + 100

x - 100 = 900

x = 900 - 100

x = 800

nha bn

x - 100 = 800 + 100

x - 100 = 900

       x   = 900 + 100

       x   = 1000

Nhẩm theo mẫu và ghi kết quả như sau:

800 : 2 =400

300 : 3 = 100

800 : 4 = 200

a) y + 100 = 800 - 600

y + 100 = 200

y           = 200 - 100

y           = 100

b) y - 500 = 100 + 100

y - 500 = 200

y          = 200 + 500

y          = 700

\(a,y+100=800-600\)

\(y+100=200\)

\(y=200-100\)

\(y=100\)

\(b,y-500=100+100\)

\(y-500=200\)

\(y=200+500\)

\(y=700\)

100 + x = 200 + 800

100 + x = 1000

          x = 1000 - 100

          x = 900

kết bạn nhé

100 + x = 200 + 800

100 + x = 1000

         x = 1000 - 100

         x = 900

200 + 600 + 800 + 100 + 400 = 2100

k mik nhé

200 + 600 + 800 + 100 + 400

= (200 + 800) + (400  + 600) + 100

= 1000 + 1000 + 100

= 2000 + 100

= 2100

happy new year

100 + 200 + 800 + 300 + 900 + 700 = 3000 nha mk nha

3000 ban nha tk minh nha ban

x + 600 = 100 + 800

x + 600 = 900

          x = 900 - 600

          x = 300

Vậy x = 300

x + 600 = 100 + 800

x + 600 = 900

x          = 900 - 600

x          = 300

ai tk mk mk tk lại ^_^