Question

Срочно помогите 20м с решением

Answer 1

Объяснение:

$\left \{ {{\frac{u+m}{9}-\frac{u-m}{3}=2\ |*9 } \atop {\frac{2u-m}{6}-\frac{3u+2m}{3}=-20 \ |*6}} \right. \ \ \ \ \left \{ {{u+m-3*(u-m)=2*9} \atop {2u-m-2*(3u+2m)=-20*6}} \right. \ \ \ \ \left \{ {{u+m-3u+3m=18} \atop {2u-m-6u-4m=-120}} \right. \ \ \ \ \\\left \{ {{-2u+4m=18\ |:(-2)} \atop {-4u-5m=-120\ |*(-1)}} \right. \ \ \ \ \left \{ {{u-2m=-9} \atop {4u+5m=120}} \right. \ \ \ \ \left \{ {{u=2m-9} \atop {4*(2m-9)+5m=120}} \right. \ \ \ \ \left \{ {{u=2m-9} \atop {8m-36+5m=120}} \right.$

$\left \{ {{u=2m-9} \atop {13m=156\ |:13}} \right.\ \ \ \ \left \{ {{u=2*12-9=15} \atop {m=12}} \right. .$

Ответ: u=15    

            m=12.