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evaanisimova
@evaanisimova
July 2022
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а)16y²-b²=? б)9b²-6bc+c²=? в)25a²b²-16x в 4 степени=? г)36a²-(a-4)²=?
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Trofimkirillov
А)16y²-b²=(4y+b)(4y-b)
б)9b²-6bc+c²=(3b-c)²
в)25a²b²-16x⁴=(5ab-4x²)(5ab+4x²)
г)36a²-(a-4)²=36a²-a²-8a+16=35a²-8a+16
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evaanisimova
Спасибочки)
rubilovalex
16y^2-b^2=(4y-b)*(4y+b); 9b^2-6bc+c^2=(3b-c)^2; 25a^b^2-16x^4=(5ab-4x^2)*(5ab+4x^2); 36a^2-(a-4)^2=(6a-a+4)*(6a+a-4)=(5a+4)*(7a-4). я так думаю, но не уверен в последнем. проверьте на всякий случай.
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Answers & Comments
б)9b²-6bc+c²=(3b-c)²
в)25a²b²-16x⁴=(5ab-4x²)(5ab+4x²)
г)36a²-(a-4)²=36a²-a²-8a+16=35a²-8a+16