Question

2,3,4 помогите плз.......

Answer 1

$1)\; \; \sqrt4<\sqrt5<\sqrt9\; \; \to \; \; \; 2<\sqrt5<3\qquad (\sqrt5\approx 2,24)\\\\\sqrt[3]{125}=\sqrt[3]{5^3}=5\\\\\sqrt5<5\\\\2)\; \; \sqrt[3]{8x^5y^6z^7}=\sqrt[3]{2^3\cdot x^3\cdot x^2\cdot (y^2)^3\cdot (z^2)^3\cdot z}=2\cdot x\cdot y^2\cdot z^2\cdot \sqrt{x^2z}\\\\3)\; \; \; (y+3)^{\frac{2}{3}}\\\\y+3>0\; \; \to \; \; y>-3\\\\y\in (-3,+\infty )$