Question

Пожалуйста помогите решить 562

Answer 1

$\displaystyle 1)x:2\frac{1}{7}=7\\\\ x:\frac{15}{7}=7\\\\ x*\frac{7}{15}=7\\\\ \frac{7}{15}x=7\\\\ x=15\\\\ 2)1\frac{1}{3}:x=\frac{1}{3},x\neq 0\\\\ \frac{4}{3}*\frac{1}{x}=\frac{1}{3}\\\\ \frac{4}{3x}=\frac{1}{3}\\\\ 12=3x\\3x=12\\x=4\\\\ 3)x:0,2=20\\\\ x:\frac{1}{5}=20\\\\ x*5=20\\5x=20\\x=4\\\\ 4)0,9:x=3,x\neq 0\\\\ \frac{9}{10}*\frac{1}{x}=3\\\\ \frac{9}{10x}=3\\\\ 9=30x\\30x=9\\\\ x=\frac{3}{10}=0,3$