Question

$d + c = 8 \\ d \times (d + c) = 24$
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Answer 1

Объяснение:

$\left \{ {{d+c=8} \atop {d*(d+c)=24}} \right. \ \ \ \ \left \{ {{d+c=8} \atop {d*8=24\ |:8}} \right. \ \ \ \ \left \{ {{d+c=8} \atop {d=3}} \right. \ \ \ \ \left \{ {{3+c=8} \atop {d=3}} \right. \ \ \ \ \left \{ {{c=5} \atop {d=3}} \right. .$

Ответ: c=5    d=3.