Question

三个数成等比数列,它们的和为32,它们的积为1728,则此三数为

Answer 1

设a/q,a,a*q;
a/q+a+a*q=32 =>a*(1/q+1+q)=32;
a/q*a*a*q=1728 => a=12;
得出3q^2-5q+3=0则b^2-4ac