решите уравнения (12m-5m)х4=252 (1) (2)(4n+3n)х 11=154 3)45:(4m-m)=3 (4)(12x-5x):4=14       (5)132-(x-5)x9=69 (6)123-(8x-11)x2=49 (7) 3(x+7)+16=52

(12m - 5m) * 4 = 252                     (4n + 3n) * 11 = 154

7m = 252 : 4                                   7n = 154 : 11

7m = 63                                           7n = 14

m = 63 : 7                                        n = 14 : 7

m = 9                                               n = 2

45 : (4m - m) = 3                             (12x - 5x) : 4 = 14

3m = 45 : 3                                       7x = 14 * 4

3m = 15                                            7x = 56

m = 15 : 3                                          x = 56 : 7

m = 5                                                 x = 8

132 - (x - 5) * 9 = 69                         123 - (8x - 11) * 2 = 49

(x - 5) * 9 = 132 - 69                         (8x - 11) * 2 = 123 - 49

(x - 5) * 9 = 63                                   (8x - 11) * 2 = 74

x - 5 = 63 : 9                                      8x - 11 = 74 : 2

x - 5 = 7                                             8x - 11 = 37

x = 7 + 5                                            8x = 37 + 11

x = 12                                                8x = 48

                                                          x = 48 : 8

                                                          x = 6

3 (х + 7) + 16 = 52

3 (х + 7) = 52 - 16

3 (х + 7) = 36

х + 7 = 36 : 3

х + 7 = 12

х = 12 - 7

х = 5