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Stiind ca a+b+c=7 si 4×a+3×b+2×c=18 afla (5×a+4×b+3×c)×(3×a+2×b+c).

Răspuns :

Ca sa aflii cat e 5×a+4×b+3×c aduni cele 2 relatii pe care la stii : a+b+c + 4×a+3×b+2×c= 7+18 => 5×a+4×b+3×c= 25
4×a+3×b+2×c -(a+b+c) = 18-7 => 3×a+2×b+c= 11
=> 25×11= 275