Ответ:
1
1)(a+5)(a-5)=a²-25
2)16-x²
3)4a²-49
2
1)144x²-169y²
2)a⁶-b⁸
3)100x⁶y²-1/81x²y⁴
3
1)7x²+7y²
2)4x+13
3)-y²+3y+18
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Ответ:
1
1)(a+5)(a-5)=a²-25
2)16-x²
3)4a²-49
2
1)144x²-169y²
2)a⁶-b⁸
3)100x⁶y²-1/81x²y⁴
3
1)7x²+7y²
2)4x+13
3)-y²+3y+18