Question

решите систему 7u+2v=1 и 17u+6v=-9

Answer 1

$left { {{7u+2v=1 /*(-3 )} atop {17u+6v=-9}} right. \ left { {{-21u-6v=-3 } atop {17u+6v=-9}} right. +\ -21u+17u-6v+6v=-3-9\ -4u=-12 |:(-4)\ u=3 \ 7*3+2v=1\ 21+2v=1\ 2v=1-21\ 2v=-20\ v=-20:2\ v=-10$
ответ: (-10; 3)

Answer 2

обнови страницу