\(a.x=800-200\)

\(x=600\)

\(b.x=700-300\)

\(x=400\)

a ) x = 800 - 200 = 600

b ) x = 700 - 300 = 400 

k mình nha

x + 256 = 300

x = 300 -256

x = 44

x + 752 = 800

x = 800 - 752

x = 48

x - 800 = 100

x = 100 + 800

x = 900.

x + 256 = 300

x          = 300 - 256

x          = 44

x + 752 = 800

x          = 800 - 752

x          = 48

x - 800 = 100

x         = 100 + 800

x         = 900

a: 3

b: 52

c: 29

d: 7

e: 33

g: 32

h: 46

i : 801

9:x=3

x=9:3

x=3

vậy x=3

x+25=77

x=77-25

x=52

vậy x=52

67-x=38

x=67-38

x=29

vậy x=29

5×x=35

x=35:5

x=7

vậy x=7

66+x=41+58

66+x=99

x=99-66

x=33

vậy x=33

28+x=30×2

28+x=60

x=60-28

x=32

vậy x=32

54+x=50+50

54+x=100

x=100-54

x=46

vậy x=46

108+x=800+109

108+x=909

x=909-108

x=801

vậy x=801

x = 300

X+500=800

X=800-500

X=300

Vậy X=300

X=800

x + 200 = 800+200

x + 200 = 1000

x = 1000 - 200

x = 800

vậy x =800

k nha

x + 800 = 700 + 300

x + 800 = 1000

x          = 1000 - 800

x          = 200

x+800=700+300

x+800=1000

x=1000-800

x=200

\(x+600=800+10\)

\(x+600=810\)

              \(x=810-600\)

              \(x=210\)

x+600=810

x=810-600

x=210

x+200=1800

x=1800-200

x=1600

x+200=800+1000

=>x+200=1800

=>x=1800-200

=>x=1600

vậy...

x -100 =800

x = 800 + 100

x = 900

x - 100 = 800

x         = 800 + 100

x         = 900

x=500 nhé bạn

500+800+900=600+700+900