Question

Afla nr a,b,c stiind ca a+b=2000,b+c=3000,a+c=4000

Answer 1

a+b+b+c+a+c=2000+3000+4000
a+b+b+c+a+c=9000
2a+2b+2c=9000
a+b+c=9000:2
a+b+c=4500
2000+c=4500
c=4500-2000
c=2500
a+2500=3000
a=3000-2500
a=500
500+b=2000
b=2000-500
b=1500

Raspuns : a=500   b=1500   c=2500

Answer 2

Aduni cele trei relații și Îți dă 2a+2b+2c=9000 a+b+c=4500 c=4500-(a+b)=4500-2000=2500 b=4500-(a+c)=4500-4000=500 a=4500-(b+c)=4500-3000=1500