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Daca a+b=24 b+c=32 calculează a+3b+2c=?

Răspuns :

a+b=24
b+c=32
a+3b+2c=a+2b+b+2c=a+b+2(b+c)=24+2x32=24+64=88
B+c=32 deci 2b+2c=64 iar daca mai adaugam a+b=24 va fi a+3b+2c=88