Question

Люди, прошу, у меня последние 11 баллов остались, решите эти 2 уравнения

Answer 1

$1)\frac{1}{5}x*15-\frac{1}{3}(1\frac{1}{5}x-27)*15=15x+(\frac{1}{2}x+3)*15\\\\3x-5(\frac{6}{5}x-27)=15x+(\frac{1}{2x}+3)*15\\\\3x-6x+135=15x+7,5x+45\\\\-3x+135=22,5x+45\\\\25,5x=90\\\\x=3\frac{9}{17}$

$2)x^{8}-\frac{1}{49}x^{6} =0\\\\(x^{4})^{2}-(\frac{1}{7}x^{3})^{2}=0\\\\(x^{4}-\frac{1}{7}x^{3})(x^{4}+\frac{1}{7}x^{3})=0\\\\1)x^{4}-\frac{1}{7}x^{3}=0\\\\x^{3}(x-\frac{1}{7} )=0\\\\x_{1}=0\\\\x-\frac{1}{7}=0\\\\x_{2}=\frac{1}{7}$

$2)x^{4}+\frac{1}{7}x^{3}=0\\\\x^{3}(x+\frac{1}{7})=0\\\\x_{3}=0\\\\x+\frac{1}{7}=0\\\\x_{4}=-\frac{1}{7}$