Ответ:

1-в

3-(а+4)^2=а^2+8a+16

4-(3a-1/3b)^2=9a^2-2*3a*1/3b+1/9b^2=9a^2-2ab+1/9b^2

5-x^2+9-(x+3)^2=x^2+9-(x^2+6x+9)=x^2+9-x^2-6x-9=-6x

6-36m^4-12m^2+1=(6m^2-1)^2

7-(4-x)^2-x(x-3)=12;

  16-8x+x^2-x^2+3x=12;

-8x+x^2-x^2+3x=12-16;

-5x=-4;

x=4/5

8-8,97^2=80,4609

9- -(a-3b)^2+30ab+(4b-3a)=-(a^2+6ab+9a^2)+30ab+16b^2-24ab+9a^2=-a^2-6ab-9a^2+30ab+16b^2-24ab+9a^2=-a^2+16b^2=4+16*9=4+144=148

при а=-2

     b=3

Пошаговое объяснение: