Question

1：已知b分之a=a分之c=k,b分之c=12,（ab≠0,k＞0）求k的平方+2k的值 2：见图

Answer 1

1.b=a/k;c=ak;

c/b=k^2=12,k＞0

k^2+2k=12+2*3.464=18.928

2.