Які з рівнянь є біквадратними? 1) х⁴+ 5х² — 7 = 0
2) х² — 9 = 0
3) x⁴ +13х – 4 = 0
4) х²+ 5x — 7 = 0
5) - х⁴+13x²-4 =0​
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