1.(х²-2х)²-х²(х+3)(х-3)+2х(2х²+5)=х⁴-4х³+4х²-х⁴+9х²+4х³+10х=13х²+10х
2. 25х⁴-49=(5х²-7)(5х²+7)
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1.(х²-2х)²-х²(х+3)(х-3)+2х(2х²+5)=х⁴-4х³+4х²-х⁴+9х²+4х³+10х=13х²+10х
2. 25х⁴-49=(5х²-7)(5х²+7)