Разложите на множители:1)(a+9)^2+2a(a+9)2)x^2(b-2)+y(2-b)3)(a+b)^3-a(a+b)^24)m(x-y)-n(y-x)5)30x^80+80^306)2m(a-3)-5c(3-a)7)12m(m-n)-6n(n-m)8)(x-y)^2+x-y

1)(a + 9)^2 + 2a(a + 9) =(a + 9) * ( a + 9+ 2а) = (a + 9) * ( 3a + 9); 2) x^2(b - 2)+y (2 - b) = x^2(b - 2)- y (b - 2) = (b - 2) ( x^2 - у); 3) (a + b)^3 - a(a + b)^2 = (a + b)^2 * (a + b - а) = (a + b)^2 *b; 4) m(x - y) - n( y- x) = m(x - y) + n(x - y) = (x - y) (m + n); 5) 30x * 80 + 80 * 30 = 80 *30 ( х + 1) = 2 400 (х + 1); 6) 2m ( a -3 ) - 5c (3 - a ) = 2m ( a -3 ) + 5c ( a -3 ) = ( a -3 ) ( 2m + 5c); 7) 12m( m - n) - 6n(n - m) =12m( m - n) + 6n ( m - n) =( m - n) ( 12m + 6n ); 8 )(x - y)^2 + x - y = (x - y) (x - y + 1).