Помогите 8кл алгебра 100баллов

1
$\sqrt{(2,8)^2}= 2.8^{(2* \frac{1}{2}) } =2.8^1=2.8 \\ \sqrt{(-1.3)^2}= (-1.3)^{(2* \frac{1}{2}) } =(-1.3)^1=-1.3 \\ \sqrt{(-0.5)^2}= (-0.5)^{(2* \frac{1}{2}) } =(-0.5)^1=-0.5 \\ \sqrt{(4.51)^2}= 4.51^{(2* \frac{1}{2}) } =4.51^1=4.51$

2
$\sqrt{6^4}= 6^{(4* \frac{1}{2} )}= 6^{2}=36 \\ \sqrt{(-4) ^{8} }= (-4)^{(8* \frac{1}{2}) }= (-4)^{4}=256 \\\sqrt{(-0.3) ^{6} }= (-0.3)^{(6* \frac{1}{2} )}= (-0.3)^{3}=- 0.027\\ \sqrt{3^6*6^4}= \sqrt{3^6}* \sqrt{6^4}=3^3*6^2=27*36= 972$

3
$\sqrt{b^2}=b$
$\sqrt{0.36}y^2=0.6y^2$

4
$\sqrt{32-10 \sqrt{7} }= \sqrt{2*16-2*5 \sqrt{7} }= \sqrt{2*(16-5 \sqrt{7} )} = \sqrt{2} \sqrt{16-5 \sqrt{7} }$