Question

помогите решить, непонятно​

Answer 1

Объяснение:

$\left \{ {{C_6}+C_8=82 \atop {C_8-C_3=12}} \right. \ \ \ C_1=?\ \ \ \ D=?.\\\left \{ {{C_6}+C_8=82 \atop {C_8-C_3=12}} \right.\ \ \ \ \left \{ {{C_1+5d+C_1+7d=82} \atop {C_1+7d-(C_1+2d)=12}} \right.\ \ \ \ \left \{ {{C_1+5d+C_1+7d=82} \atop {C_1+7d-C_1-2d)=12}} \right.\ \ \ \ \left \{ {{2C_1+12d=82} \atop {5d=12\ |:5}} \right.$

$\left \{ {{2C_1+12*2,4=82} \atop {d=2,4}} \right. \ \ \ \ \left \{ {{2C_1+28,8=82} \atop {d=2,4}} \right.\ \ \ \ \left \{ {{2C_1=53,2\ |:2} \atop {d=2,4}} \right.\ \ \ \ \left \{ {{C_1=26,6} \atop {d=2,4}} \right. .$

Ответ: C₁=26,6   d=2,4.