Question

боже,помогите!!!дам 15 баллов​

Answer 1

$\displaystyle 1)\frac{15}{16}*1\frac{1}{15}*\frac{17}{18}*1\frac{1}{17}*\frac{19}{20}=\frac{15}{16}*\frac{16}{15}*\frac{17}{18}*\frac{18}{17}*\frac{19}{20}=\frac{19}{20}=0,95\\\\2)(1\frac{13}{25}+x)-\frac{12}{25}=4\frac{2}{25}\\\\(\frac{38}{25}+x)-\frac{12}{25}=\frac{102}{25}\\\\\frac{38}{25}+x-\frac{12}{25}=\frac{102}{25}\\\\\frac{26}{25}+x=\frac{102}{25}\\\\x=\frac{102}{25}-\frac{26}{25}\\\\x=\frac{76}{25}=3\frac{1}{25}=3,04$