а³-8b³= a³-2³b³= a-(2b)³= (a-2b)×(a²+a×2b+(2b)²)= (a-2b)×(a²+2ab+4b²)
А)а<span>³+b</span><span>³
б)</span>a³-b³
в)a<span>³-8
г)a</span>³-8
д)а<span>³+27
е)а</span><span>³-27
ж)а</span>³+64
з)а<span>³-64
</span>и)8а<span>³+b</span>³
к)а<span>³-8b</span><span>³
л)27а</span>³+8а<span>³
м)8а</span>³-27b<span>³</span>
D= 16*16-4*16*3=64
х1=(-16-8)/32= -0,75
х2=(-16+8)/32= -0,25