1) (9x+xy) + (8y+72)=x(9+y)+8(9+y)=(9+y)+8x
2) (4a+4b)-(ay+by) = 4(a+b)-y(a+b)=(4-y)(a+b)
3) (11ay-by)-(77a-7b)=y(11a-b) - 7(11a-b) = (y-7)(11a-b)
А)(х-4у)(х+4у)=х²-16у²
(а+в)(а-в)=а²-в²
б)(6а+2)(6а-2)=36а²-4
в)(у^6-3х)(3х+^6)=у^12-9х²
г)(3х²-у³)(3х²+у³)=9х^4-у^6
^степень числа
81x^2 - ( 4 - 9x ) ^2 = 56 ;
81x^2 - ( 16 - 72x + 81x^2 ) = 56 ;
81x^2 - 16 + 72x - 81x^2 = 56 ;
72x = 56 + 16 ;
72x = 72 ;
X = 1