Question

<p>Реши уравнения: X - 640 = 921 : 3;  X : 9 = 2007 : 9; X * 81 = 729 : 3

Answer 1

х-640=307
х=307+640
х=947

х/9=2007/9
х/9=223
х=223*9
х=2007

81х=729/3
81х=243
х=243/81
х=3