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a fost răspuns

a+b+c +d =420 a+ b+ c=312 b+d=212 d+c=210

Răspuns :

a+b+c+d-a-b-c=420-312
d=108
b=212-d=212-108=104
c=210-d=210-108=102
a=312-104-102=106
Irimiaanabianca
420-312=108 (d)
212-108=104 (b)
210-104=106 (c)
108+104+106=318(b+c+d)
420-318=102 (a)

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