Question

X^1/2-y^1/2 делённое на х-у

при х=4 ,а у=9

Answer 1

$x^{0.5}- y^{0.5} /(x-y)= (sqrt{x} - sqrt{y}) /(x-y)=(sqrt{x} - sqrt{y})/(sqrt{x} - sqrt{y})( sqrt{x} + sqrt{y}) =1/(sqrt{x} +sqrt{y})=1/ (sqrt{4} + sqrt{9})=1/(2+3)=1/5=0.2$