Daca x+4y =25 si 11x+3z=19calculati 35x+8y+9z

Răspuns :

x+4y=25
11x+3z=19
35x+8y+9z=2x+33x+8y+9z=2x+8y+33x+9z=2(x+4y)+3(11x+3z)=2*25+3*19=
=50+57=107
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