Question

Помогите пожалуйста С б даю 20 баллов

Answer 1

1.

$\sqrt[3]{8*0.125} =\sqrt[3]{2^{3}*0.5^{3}} =2*0.5=1$

$\sqrt[3]{}\frac{24}{375}  =\frac{\sqrt[3]{3*8} } {\sqrt[3]{125*3}} = \frac{\sqrt[3]{2^{3}*3}} { \sqrt[3]{5^{3}*3} }=\frac{2\sqrt[3]{3}} {5\sqrt[3]{3} }= \frac{2}{5} =0.4$

2.

$12^{\frac{1}{4}*12 } *12^{2}=12^{3}*12^{2}=12^{5}$

3.

$\frac{11^{1.5}}{11^{0.3}} =11^{1.5-0.3}=11^{1.2}=11\sqrt[5]{11}$

4.

$\frac{10^{-7}*81^{12}}{27^{17}*10^{-5}} =\frac{10^{5}*(3^{4})^{12}}{10^{7}*(3^{3})^{17}} =\frac{10^{5}*3^{48}}{10^{7}*3^{51}}= \frac{1}{10^{2}*3^{3}} =\frac{1}{2700}$

5.   ....................................

(√(2x+6))²=(1-x)²

2x+6=1 - 2x+x²

x²-4x-5=0

D/4=2²+5=9  ( ±3²)

х1=2+3=5

х2=2-3= -1