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stiind ca a+b=12, b+c=45 si c+a=215 calculati (a+b+c):2​

Răspuns :

Explicație pas cu pas:

a+b=12

b+c=45

c+a=215

2(a+b+c)=272:2=136

(a+b+c):2=136:2=68

Răspuns:

a+b=12

b+c=45

c+a=215

a+b+b+c+c+a=12+45+215

2a+2b+2c=272

2(a+b+c)=272

a+b+c=272:2=>a+b+c=136

(a+b+c):2=136:2=68