Question

determinati 10x+27y+9z stiind ca 2x+3y=17 si 4y+3z=74

Answer 1

$10x+27y+9z=$

$=10x+15y+12y+9z=$

$=5(2x+3y)+3(4y+3z)=$

$=5*17+3*74=$

$=85+222=307$

Answer 2

Vine 2xde 5ori => 17X5
Vine 3z de 3 ori => 74X3
27y = 3x X 5 + 4x X 3 = 15x + 12x = 27x
10x+27y+9z= 17X5+74X3= 85+222= 307
Bafta!!