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a fost răspuns

Aflati x din proportia :
3X-1 pe 7 = 5X+4pe 12,8

Răspuns :

3x-1    5x+4
------ = ------     (3x-1)12.8 = (5x+4)7  ⇒ 38.4x-12.8 =35x+48 ⇒
    7      12.8                                            38.4x-35x =48+12.8 ⇒
                                                               3.4x= 60.8 ⇒
                                                                x=60.8
                                                                   ------
                                                                   3.4      ⇒ x =17.88


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