Question

Решите систему уравнение методом сложения и проверка снизу напишите​

Answer 1

$\displaystyle\tt+\left \{ {{a+b=21.6} \atop {a-b=10.4}} \right. \left \{ {{2a=32} \atop {}} \right. \\\\2a=32\\\\a=\frac{32}{2}\\\\a=16\\\\\left \{ {{a=16~~~~~~~} \atop {a-b=10.4}} \right. \left \{ {{a=16~~~~~~~~} \atop {16-b=10.4}} \right. \left \{ {{a=16~~~~~~~~~} \atop {b=16-10.4}} \right. \\\\\\\left \{ {{a=16~} \atop {b=5.6}} \right.$

Проверка:

$\displaystyle\tt\left \{ {{a+b=21.6} \atop {a-b=10.4}} \right. \left \{ {{16+5.6=21.6} \atop {16-5.6=10.4}} \right.$

ответ: 16; 5,6.