Ответ:
1.
9y²-5y+7-3y²-2y+1=6y²-7y+8
2.
-6a⁴+15a³-6a
3.
14x⁴+21x²-14x⁴=21x²
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Answers & Comments
Ответ:
1.
9y²-5y+7-3y²-2y+1=6y²-7y+8
2.
-6a⁴+15a³-6a
3.
14x⁴+21x²-14x⁴=21x²