Ответы на вопрос:
1) 4y²-9(5y-1)²=(2y)²-(3(5y-1))²=(2y-3(5y-+3(5y-1))=(2y-15y+3)(2y+15y-3)= =(3-13y)(17y-3) 2) 9a²-16(4a-3)²=(3a)²-(4(4a-3))²=(3a-4(4a-3)(3a+4(4a-3))=(3a-16a+12)(3a+16a-12)= =(12-13a)(18a-12) 3) 25(5m+n)²-4n²=(5(5m+n))²-(2n)²+(5(5m+n)-2n)(5(5m+n)+2n)= =(25m+5n-2n)(25m+5n+2n)=(25m+3n)(25m+7n)
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