Question

помогите пожалуйста​

Answer 1

$\frac1x+\frac1{1\frac23x}=\frac25\\\\\frac1x+\frac1{\frac53x}=\frac25\\\\\frac1x+\frac3{5x}=\frac25\\\\\frac{5+3}{5x}=\frac25\\\\\frac8{5x}=\frac25\\\\x=\frac85:\frac25\\\\x=\frac85\cdot\frac52=4$

Answer 2

1/х+1/(х/5/3)=2/5

1/х+3/5х=2/5

8/5х=2/5

х=(8/5)/(2/5)

х=8/2

х=4