1. Преобразуйте выражения в многочлен :
1) х²+(5х-3)²,
2) (p-2c)²+3р²,
3) (3а-7b)²-42ab,
4) 81x²-(9x+7y)².
2. упростите выражение :
1) (2х-3у)²+ (3х+2у)²
2) (5а+3b)²-(5а-3b)²
3) ((((a-b)²+2ab)²-2a²b²)²-2 a^{4} b^{4} )²- a^{16} - b^{16}
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