5.18. Замените □ одночленом так, чтобы получившееся равенство было тождеством: 1) (□+2b)²=9a⁴+12а²-b²+4b⁴; 3) (3x²-2,5y)²=9x⁴+□+6,25y; 2) (15m+ □)²=225m²+12nm+0,16n⁶; 4) (3x⁴-2a⁶)²=9x⁸-12x⁴а⁶+□.​
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