4*(0,8x-0,25y)-0,7(2x-3y) если x=0,2 у=-0,6

Question

Математика: 4*(0,8x-0,25y)-0,7(2x-3y) если x=0,2 у=-0,6

АНТО14 · Accepted Answer

1) (х - 5)/20 = 6/7                          2) 2/7 = 3/4х7 * (х - 5) = 20 * 6                          х = 2/7 : 3/4                                                  7х - 35 = 120                                 х = 2/7 * 4/3                               7х = 120 + 35                                х = 8/21                               х = 155 : 7                                     Проверка:х = 155/7                                       2/7 = 3/4 * 8/21                                      ...

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