Răspuns :

Alexvalentin555id

Răspuns:

a)347

b)9

c)27

Explicație pas cu pas:

a) (a-b)+(b-c)=a-b+b-c=a-c=215+132=347

b)(a-c)-(b-c)=a-c-b+c=a-b=138-129=9

c)(a-b)+[(a-c)-(b+c)]=a-b+a-c-b-c=2a-2b-2c=90/:2=>a-b-c=45

a-b-c-(a-b)=a-b-c-a+b=-c=-27=>c=27

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