Bài 2: Tìm x, biết: a) 2x – 5 = 7 b) (x + 75) – 30 = 80 c) 70 – (35 + x) = 25 d) 2x – 138 = 2 3 . 3 2 e) 25 + 3(x – 8) = 106 f) 135 – 5(x + 4) = 35 g) 4(x – 3) = 7 2 –1 10 h) (3x – 1) 3 = 8 i) 15 – x = – 45 k) |x – 3 | = 9 l) |x + 4| –2 = 5 m) x – [42 +(–28)] = – 8
Loga
Sinh Học lớp 12
