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

200 + x = 500 + 300 

200 + x = 800 

             x = 800 - 200 

             x = 600

200 + x = 500 + 300

200 + x = 800

         x = 800 - 200

         x = 600

500 - x = 400 - 200

500 - x = 200

x = 500 - 200

x = 300 

500-x=400-200

500-x=200

      x=500-200

      x=300

k mình nha

500 - x = 200 + 100

500 - x = 300

x = 500 - 300

x = 200

500 - x = 200 + 100

500 - x = 300

        x = 500 - 300

        x = 200

x+200=300-400-500

x+200=-100-500

x+200=-600

x=-600-200

x=-800

mình nè x= -800

COPPY MOI NGUOI NHA MINH LA CHUA LAM BIENG

200 - x = 500 - 400

200 - x = 100

        x = 200 - 100

        x = 100

100+200+300+500+200:2

= 100+200+300+500+100

= 300+300+500+100

=600+500+100

=1100+100

=1200

k mik nha

650 nha!

x + 100 = 500 + 200

x + 100 = 700

         x  = 700 - 100

         x  = 600

tk mk mk tk lại

x + 100 = 500 + 200

x + 100 = 700 

x          = 700 - 100

x          = 600

\(20^2+x=500\)

              \(x=500-20^2\)

              \(x=500-400\)

               \(x=100\)

20^2+x=500

400+x=500

x=500-400

=100