Question

помогите с 9,умоляю

Answer 1

c1m1(t2-t1)+c2m2(t2-t1)+c3m3(t2-t1)=cm(t2-t1)
c2m2(t2-t1)=cm(t2-t1)-(c1m1(t2-t1)+c3m3(t2-t1))
$c2 = frac{cm(t2 - t1) - (c1m1(t2 - t1) + c3m3(t2 - t1))}{m2(t2 - t1)}$