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Tutuianufilofteia37
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. Calculați a+b+c+d, ştiind că: a=2b; a+b= c; d: 3 = c; c+d=840 b) 1 060 c) 1 080 d) 1 150 va rog ​

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Dianageorgiana794

Răspuns:

[tex]a=2b\\\\a+b=c\\\\d/3=c= > d=3c\\\\c+d=840\\\\c+3c=840= > c=840:4= > c=210\\\\d=3*210= > d=630\\\\a+b=210= > 2b+b=210= > b=210:3= > b=70\\\\a=70*2= > a=140\\\\a+b+c+d=140+70+840=1050\\\\[/tex]

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