11/24/2011 1:47:43 PMNguyn Hu Tr43

i xng hai bn

7-9

Fig. 7.9

11/24/2011 1:47:43 PMNguyn Hu Tr44

i xng hai bn

11/24/2011 1:47:43 PMNguyn Hu Tr45

i xng ta trn

11/24/2011 1:47:43 PMNguyn Hu Tr46

Khng c tnh i xng

Lch s phn loi hc

11/24/2011 1:47:43 PMNguyn Hu Tr48

Aristotle 384 BC ra phng phpphn loi ng vt vthc vt