Ответ:
(9х+a)²=81x²+18xa+a².
(2c-1)(2c+1)=4c²-1 .
(3a+2b)(3a-20b)=9a²-54ab-40b².
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Ответ:
(9х+a)²=81x²+18xa+a².
(2c-1)(2c+1)=4c²-1 .
(3a+2b)(3a-20b)=9a²-54ab-40b².