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determina numerele a,b,c stiind ca a+b=700 ,b+c=500,a+c=800

Răspuns :

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a+b+b+c+a+c=700+500+800 2 (a+b+c)=2000 a+b+c=1000 a=1000-500=500 b=1000-800=200 c=1000-700=300
b=700-a
c=800-a
b+c=500
(700-a)+(800-a)=500 desfaci parantezele
700+800-2a=500
2a=2000
a=2000:2
a=1000

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