A) X + 39 = 51 + 17 B) 41– X = 24 – 9 C) X – 33 = 19 + 10 D) X + 30=74 – 32

Câu 9. Tìm x, biết: a) x + 39 = 51 + 17 b) 41– x = 24 – 9 c) x – 33 = 19 + 10 d) x + 30=74 – 32