64a³-27b⁶=(4a)³-(3b²)³=(4a-3b²)((4a)²+(4a)*(3b²)+(3b²)²=
=(4a-3b²)(16a²+12ab²+9b⁴)
(3n+2)³+(4n+5)³= (3n+2+4n+5)((3n+2)²-(3n+2)(4n+5)+(4n+5)²)=
=(7n+7)((3n+2)²-(3n+21)(4n+5)+(4n+5)²)=
=7(n+1)((3n+2)²-(3n+2)(4n+5)+(4n+5)²).
1)24b-16=32
24b=32+16
24b=48
b=48:24
b=2
3х+у=1 | *3
2х-3у=-14.
3х=1
2х=-14
х=1/3
Х=-7
Вот и все!!
5,5*10^-4 *1,66*10^-17=9,13*10^-21кг=9,13*10^-18г