Ответ:
1)ay-3y-4a+12=a(y-4)-3(y-4)=(y-4)(a-3)
2) 9a+9-na-n=9(a+1)-n•(a+1)=(a+1)•(9-n)
3) 6x+ay+6y+ax=6(x+y)+a•(y+x)=(x+y)•(6+a)
4) 8x-8y+xz-yz=8(x-y)+z•(x-y)=(x-y)•(8+z)
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Ответ:
1)ay-3y-4a+12=a(y-4)-3(y-4)=(y-4)(a-3)
2) 9a+9-na-n=9(a+1)-n•(a+1)=(a+1)•(9-n)
3) 6x+ay+6y+ax=6(x+y)+a•(y+x)=(x+y)•(6+a)
4) 8x-8y+xz-yz=8(x-y)+z•(x-y)=(x-y)•(8+z)