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1)Se stie ca a+b+c=23 si x=9. Calculati :a)14a+14b+14c+14x;
b)2013-(53a+53b+53c+10x);
c)349+6a+6b+6c-12x;
d)424-21x+3a+3b+3c;

Răspuns :

CarMina03
a)14a+14b+14c+14x=14(a+b+c+x)=14(23+9)=14*32=448 b)2013-(53a+53b+53c+10x)=2013-53(a+b+c+x)=2013-53(23+9)=2013-53*32=2013-1696=317
c)349+6a+6b+6c-12x=349+6(a+b+c)-12*9=349+6*23+12*9=349+138-108=379
d)424-21x+3a+3b+3c=424-21*9+3(a+b+c)=424-189+3*23=235+69=304

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