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

x=100

100 tk m nhé

a) x= -300 -100

x = -400

b) x= -300 +100

x= -200 

1)x+100=200-500

x+100=-300

x=-300-100

x=-400

2)x-100=200-500

x-100=-300

x=-300+100

x=-200

500 + x = 100 + 500

500 + x = 600

          x = 600 - 500

          x = 1001

300 - x = 300 + 200

300 - x = 500

         x = 300 - 500

         x = -200

400 - x = 200 + 400

400 - x = 600

         x = 400 - 600

         x = -200

k mk nha mk k l

ại ^_^

500 + 100 = 100 + 500

300 + 200 =  300 + 200

400 + 200  = 200 + 400

x+500=100

x       =100-500

x       =-400

mk nha.

Năm mới chúc các bn hok giỏi mạnh khỏe nha ^ _^

x+500=100

x=100-500

x=-400

100x200+200x500+200x400

=20000+100000+80000

=120000+80000

=200000

100 x 200 + 200 x 500 + 200 x 400

= 200 x ( 100 + 500 + 400 )

= 200 x 1000

= 200000

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

x + 100 - 200 = 500 x 2 + 100

x + 100 - 200 = 1100

x + 100 = 1100 + 200

x + 100 = 1300

         x = 1300 - 100

         x = 1200                                          k mk,mk sẽ k lại bn

x+100-200=500x2+100

x+100-200=1000+100

x+100-200=1100

x+100      =1300

x             =1200

vậy x=1200.

500-x+200=100

500-x=100-200

500-x=-100

x=500-(-100)

x=600

tk minh nha

nhanh nhat do

500-x+200=100

500-x=100+200=300

x=500-300

x=200