Tìm x:  x + 678 = 2813 

Bài 1: Tìm x

 x + 678 = 2813         4529 + x = 7685             x - 358 = 4768              2495 - x  = 698

     x  x 23 = 3082              36 x x = 27612             x : 42 = 938            4080 : x = 24     

 Bài 2: Tìm x

a.  x + 6734 = 3478 + 5782                                               2054 + x  = 4725 - 279

     x  - 3254 = 237 x 145                                                   924 - x  = 44658 : 54

 Bài 3: Tìm x

a.  x x 24 = 3027 + 2589                                                  42 x x  = 24024 - 8274

     x : 54 = 246 x 185                                                        134260 : x  = 13230 : 54

 Bài 4*: Tìm x

a. ( x + 268) x 137 = 48498                                                   ( x + 3217) : 215 = 348   

    ( x - 2048) : 145 = 246