Question

плиз срочно 3 уравнения

Answer 1

$1.\;\frac1{4x}+\frac1x=\frac38\\\frac{1+4}{4x}=\frac38\\3\cdot4x=5\cdot8\\12x=40\\x=\frac{40}{12}=3\frac13\\\\2.\;\frac1x+\frac1{\frac34x}=\frac7{12}\\\frac1x+\frac4{3x}=\frac7{12}\\\frac{3+4}{3x}=\frac7{12}\\7\cdot3x=7\cdot12\\3x=12\\x=4\\\\3.\;\frac1{2x}+\frac7{5x}=6\frac13\\\frac{5+14}{10x}=\frac{19}3\\19\cdot10x=19\cdot3\\10x=3\\x=0,3$