Question

300 + x = 400 + 200 

Answer 1

300 + x = 600

x          =600 - 300

x          =300

k nhé

Answer 2

300 + x = 400 + 200

300 + x = 600

x = 600 - 300

x = 300

K mk nha 

Answer 3

300 + x  = 400 + 200

300 + x = 600

         x = 600 - 300 

        x = 300

Answer 4

x = 300