minh moi bn vao link nay dang ky roi tra loi minigame nha : https://alfazi.edu.vn/question/5b7768199c9d707fe5722878
bài 2:
a) 135 - (x + 37) = 80
x + 37 = 135 - 80
x + 37 = 55
x = 55 - 37
x = 18
b) (x - 17) + 52 = 158
x - 35 = 158
x = 158 - 35
x = 123