Lời giải:
a.
$104^2-16^2=104^2-4^2=(104-4)(104+4)=100.108=10800$
b.
$9^8.2^8-(18^4-1)(18^4+1)$
$=(9.2)^8-(18^8-1)=18^8-(18^8-1)=1$
c.
$999^3+3.999^2+3.999+1^3=(999+1)^3=1000^3=1000000000$
d.
$=42^3-6.42^2+12.42-2^3=(42-2)^3=40^3=4^3.10^3=64.1000=64000$


