1)25.12=25.(10+2)=25.10+25.2=50+50=300
34.11=34.(10+1=34.10+34.1=340+34=374
47.101=47.(100+1)=47.100+47.1=4700+47=4747
2)16.19=16.(22-3)=16.22-16.3=352-48=304
46.99=46.(102-3)=46.102-46x3=4692-138=4554
35.98=35.(99-1)=35.99-35.1=3465-35=3430
k cho mình nha Nguyễn Hồng Nhung