3) 121m²-88mn+16n²=(11m-4n)²
4) 24ab+36a²+4b²=(6a+2b)²
5) a⁶-4a³b+4b²=(a³-2b)²
6) 25p¹⁰+q⁸+10p⁵q⁴=(5p⁵+q⁴)²
3) (a+3)³-27=(a+3)³-3³=(a+3-3)((a+3)²-3(a+3)+3²)=a(a²+6a+9-3a-9+9)=
=a(a²+3a+9)
4) (a-7)³+8=(a-7)³+2³=(a-7+2)((a-7)²-2(a-7)+2²)=(a-5)(a²-14a+49-2a+14+4)=
=(a-5)(a²-16a+67)
5) (a+4)³-27=(a+4)³-3³=(a+4-3)((a+4)²+3(a+4)+3²)=
=(a+1)(a²+8a+16+3a+12+9)=(a+1)(a²+11a+37)
6) (a-9)³+64=(a-9)³+4³=(a-9+4)((a-9)²-4(a-9)+4²)=
=(a-5)(a²-18a+81-4a+36+16)=(a-5)(a²-22a+133)