X – 45 = 5605X = 2094 – 285 X = 5605 + 45X = 1809 X = 5650C

Câu 4.a. x + 285 = 2094 b. x – 45 = 5605x = 2094 – 285 x = 5605 + 45x = 1809 x = 5650c. 6000 – x = 2000x = 6000 – 2000x = 4000Tham khảo:https://vndoc.com/vo-bt-toan-3