Question

Срочно решите уравнение прошу! 200:(15+х)+200:(15-х)=30

Answer 1

$frac{200}{15+x}+ frac{200}{15-x}=30 \ razdelim .na .200 \ frac{1}{15+x}+ frac{1}{15-x}=0.15 \ frac{15-x}{(15+x)(15-x)}+ frac{15+x}{(15-x)(15+x)}=0.15 \ frac{15-x+15+x}{(15-x)(15+x)}=0.15 \ frac{30}{(15-x)(15+x)}=0.15 \ (15-x)(15+x)=30/0.15 \ 15^2-x^2=200 \ -x^2=200-225 \ x^2=25 \x= sqrt{25} \ x_{1} =5 \ x_{2} =-5$