2,
sach giup chung ta kham pha the gioi con dc luu giu o sach nhu nhung cong thuc toan hoc ,nhung thi nghiem vat li , hoa hoc,...nho sach ta biet EDISON,Giem Oat,Oclit,Pitago,...biet den nhung Kim Tu Thap,nhung nuoc xa xoi, hieu dc nhung tuc quan, nen van hoa,cac moi quan he xa hoi phong phu ,...Co the noi sach la nguon kien thuc doi dao vo tan giup con nguoi hieu ve nhung thu xung quanh minh.
3.
su dung BPTT so sanh
''nhu nhung con chim ki dieu...cai thien va cai dep.''
tac dung lam cau van sinh dong , goi cam hon, lam cho nguoi doc hieu dc sach nhu the nao va tiep nhan cau van de dang hon.
