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

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

\(y+100=200\)

\(y=200-100\)

\(y=100\)

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

\(y-500=200\)

\(y=200+500\)

\(y=700\)

y+100=800−600

y+100=200

y=200−100

y=100

y−500=100+100

y−500=200

y=200+500

y=700

500 + 500 = 1 000

100 + 100 = 200

200 + 200 = 400

2 000 x 20 = 40 000

500 + 500 = 1000

100 + 100 = 200

200 + 200 = 400

2000 x 20 = 40000

500+500=1000

100+100=200

200+200=400

2000x20=4000

k mình nha

a)1700

b)2000

a, 500+500+500+(100 x 2)

=500 x 3+ 100x2

=1500+200

=1700

b, 700+300+(100 x 10)=700+300+1000=1000+1000=2000

k minh nha

a) = 1700

b) =2000

x + 100 = 100 + 500

x + 100 = 600

x          = 600 - 100

x          = 500

X + 100 = 500 +100

x + 100 =600

x = 600 -100 

x = 500

x + 100 = 100+500

500+100=100+500

\(x-100=500+100\)

\(x-100=600\)

              \(x=600+100\)

              \(x=700\)

Vậy \(x=700\)

chúc bn học gioi!@ shi nit chi

x - 100 = 500 + 100

x - 100 = 600

x         = 600 + 100

x          = 700

x - 100 = 500 + 100

x - 100 = 600

x = 600 + 100

x = 700

Tk mk nha 

x+100=500-100

x+100=400

x=400-100

x=300

x + 100 = 500 - 100

x + 100 = 400

x = 400 - 100

x = 300

x+100=500-100

x+100=400

x       =400-100

x       =300

x + 100 = 500 + 100

x + 100 = 600

x          = 600 - 100

x          = 500

x + 100 = 500 + 100

x          = 500+100-100

x=500.

k mik nha

bạn ra đề sai nha

a) 2 100 : 10 = 210

    4 500 : 100 = 45

    83 000 : 1 000 = 83

b) 720 : 10 : 8 = 72 : 8 = 9

    1 500 : (5 x 100) = 1 500 : 5 : 100 = 300 : 100 = 3

    60 000 : 1 000 x 6 = 60 x 6 = 360

x+100=400

x=400-100

x=100

k mình nha

x + 100 = 500 - 100

x + 100 = 400

x = 400 - 100

x = 300

Vậy x = 300

Ai tk mk 

Mk k lại

\(x+100=500-100\)

\(x+100=400\)

               \(x=400-100\)

               \(x=300\)

Vậy \(x=300\)