1) 3(x – 7) = 2x + 1 2) 5(x – 2) = 3(x + 4) 3) 7(x – 1) = x + 15 4) 4(x + 2) = x – 1 5) 3(x + 2) – x = 7 6) 4(x – 1) – (x – 4) = - 6 7) 5x – (x – 1) = 2x + 7 8) 5(x + 1) + x = 2x +1 9) (x + 7)(x – 7) + 3x = x(x + 3) 10) (x – 1)(x + 1) + 5x = x(x + 5) – 1
ai làm đc mk tích cho 5 sao