stim ca 2 este media ponderata a numerelor 2,8 ; 3/7 si x cu ponderile 5;14 respectiv 2. determinati x!!! va rog e super urgent

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29 Agustus 2025 matematica 5 minute
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stim ca 2 este media ponderata a numerelor 2,8 ; 3/7 si x cu ponderile 5;14 respectiv 2. determinati x!!! va rog e super urgent
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2,8=28/10=simplif=14/5
2=[(14/5)·5+(3/7)·14+x·2]/(5+14+2)
2=(14+6+2x)/21
2=(20+2x)/21
20+2x=2·21
2x=42-20
2x=22
x=22/2
x=11
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