7/(√3-√х) = [7*(√3+√х)] / [(√3 - √х)*√3 + √х)] =
= [7*(√3 + √х)] / [(√3)² - (√х)²] = [7*(√3 + √х)] / (3 - x)
7/(√3-√х) = [7*(√3+√х)] / [(√3 - √х)*√3 + √х)] =
= [7*(√3 + √х)] / [(√3)² - (√х)²] = [7*(√3 + √х)] / (3 - x)