Question

Памагите , срочноооьоооо

Answer 1

Ответ:

1) x=7,4 y=11,72

2×7,4/11,72-7,4/2×11,72=14,8/11,72-7,4/23,44=555/586=0,947098976

Answer 2

$\dfrac{2x}{y}-\dfrac{y}{2x}=\dfrac{4x^2-y^2}{2xy}=\dfrac{(2x-y)(2x+y)}{2xy}\\\\\\a)\ \ x=18,1-10,7=7,4\ \ \ y=35-23,8=11,2\\\\\\\dfrac{(2x-y)(2x+y)}{2xy}=\dfrac{(14,8-11,2)(14,8+11,2)}{2\cdot 7,4\cdot 11,2}=\dfrac{3,6\cdot 26}{165,76}=\dfrac{93,6}{165,76}=\\\\\\=\dfrac{9360}{16576}=\dfrac{585}{1036}$

$b)\ \ x=10\dfrac{5}{6}-1\dfrac{1}{2}=9\dfrac{1}{3}=\dfrac{28}{3}\ \ ,\ \ y=11\dfrac{3}{5}+9\dfrac{2}{3}-\dfrac{4}{15}=\dfrac{315}{15}=21\\\\\\\dfrac{(\frac{56}{3}-21)(\frac{56}{3}+21)}{2\cdot \frac{28}{3}\cdot 21}=\dfrac{-7\cdot 119}{3\cdot 21\cdot 28\cdot 2}=-\dfrac{119}{3\cdot 2\cdot 28\cdot 3}=-\dfrac{119}{504}$