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Математика visibility 78 просмотров

Вопрос:

два мальчика вышли навстречу друг другу расстояние между ними 12 км скорость 1-го мальчика

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Ответы и объяснения от Мегамозга

Мегамозг

х-швидкість другого.                                   х+2/3х=12:1.5.                                                                                               5/3х=8.                                                                                                           х=8*3/5.                                                                                                          х=4.8. км/год.                                                                                               2/3=х/4.8                                                                                                        3х=9.6                                                                                                            х=3.2 км/год                                                                                                                                                                                                                     

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