解核纯念:两边取改困自然对数,得:ln27=ln12+0.6t∴裤野t=(ln27-ln12)/0.6=5(ln27-ln12)/3≈1.3515503603605479399267103848812
e^(0.6t)=27/12=2.250.6t=ln2.25t=ln2.25/0.6=1.35155