5) (y-1)*(y+2)
6) (a+2)*(x-y)
7) (x-8)*(x+8)
8) (3a-4b)*(3a+4b)
решение на фото..............
1)13(2+4х)-5=26+52х-5=21+52х
2)(с+3)^2-2с(3-2с)с^2+6с+9-6с+4с^2=5с^2+9
<span>(x-3)^2>(x-4)(x+4)+1;
</span><span>(x-3)^2>x^2-16+1;
</span><span>x^2-6x+9>x^2-16+1;
</span><span>-6x+9>-16+1;
</span><span>9+16-1>6x;
</span><span>9+16-1>6x;
</span>24>6x;
x<4;