2. 8+а³=2³+а³=(2+а)(4-2а+а²); 3. 8х³-1=(2х)³-1³=(2х-1)(4х²+2х+1); 4. 64х³+27у³=(4х)³+(3у)³=(4х+3у)(16х²-12ху+9у²); 5. 0,125х³-0,001у³=(0,5х)³-(0,1у)³=(0,5х-0,1у)(0,25х²+0,05ху+0,01у²); 6. х³-у^6=(х-у²)(х²+ху²+у⁴); 7.-а^6+1/8=(1/2)³-(а²)³=(1/2-а²)(1/4+1/2а+а⁴)