Question

Áp dụng tính chất a(b-c)=ab-ac.Hãy tính nhanh 16×99 ; 35×98

Answer 1

\(16\cdot99=16\cdot100-16=1600-16=1584\)

\(35\cdot98=35\cdot100-35\cdot2=3500-70=3430\)

Answer 2

16.99=16.(100-1)=16.100-16.1=1600-16=1584

35.98=35.(100-2)=35.100-35.2=3500-70=3430

Answer 3

`16xx99=16xx100-16xx1=1600-16=1584`

`35xx98=35xx100-35xx2=3500-70=3430`