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daca a+2×b=5si b+2×c=91,atunci calculati 5×a+13×b+6×c

Răspuns :

Iakabcristina2
a+2b=5
b+2c=91

5(a+2b)=25 sau 5a+10b=25
3(b+2c)=273 sau 3b+6c=273
=>5a+13b+6c=298
Cocirmariadenis

5 × a + 13 × b + 6 × c = 298

= 5 × ( a + 2 × b ) + 3 × ( b + 2 × c ) =

= 5 × 5 + 3 × 91 =

= 25 + 273 =

= 298

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