b) 200 x 4 = .800.....              300 x 2 = ..600....

200 x 2 = .400.....             300 x 3 = ...900...

400 x 2 = ...800...             500 x 1 = ..500....

100 x 4 = ..400....             100 x 3 = .300.....

800

400

800

400

600

900

500

300

ai giúp mình với

x = 300

ai k mk,mk k lại

x = 100 

ai k mk,mk k lại

x + 100 = 300 - 100

x + 100 = 200

x = 200 - 100

x = 100

Tk mk mk tk lại . Hi hi 

x - 300 = 400 - 100 - 100

x - 300 = 200

x = 200 + 300

x = 500.

x = 500 nhé bạn

x = 500

x + 100 + 100 = 200 + 300

x + 200          = 500

x                   = 500 - 200

x                   = 300

x =300

x + 100 + 100 = 200 + 300

x + 100 + 100 = 500

x                         =500-100-100

x                        =       300

k nha 

x + 100 = 200 - 300 + 100

x + 100 = -100 + 100

x + 100 = 0

x = 0 - 100

x = -100

x+100=200-300+100

x+100=-100+100

x+100=0

x=0-100

x=-100

k mk nhé

x+100=200

x=200-100

x=100

x-100=200-300

x-100=-100

x=0

k mk nha

x + 100 = 200

         x = 200 - 100

         x = 100

x - 100 = 200 - 300

x - 100 = -100

        x = -100 + 100

        x = 0

x=200-100

x=100

x-100=200-300

x-100=-100

x=-100+100

x=0

= 3300 nhé

3000 : 100 x 100 + 300

= 30  x 100 + 300

= 3000 + 300

= 3300

3000 : 100 x 100 + 300 

= 30 x 100 + 300

= 3000 + 300

= 3300

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+300=100+300

X+300=400

x=400-300

x=100

Vậy x=100

k mk nha!

x + 300 = 100 + 300

x + 300 =     400

x          =  400 - 300

x          =      100

x+300=100+300

x+300=400

       x=400-300

       x=100

chuc bn hoc gioi!