Question

$81 - x : \ belenoe : na sqrt{y} + 9$

Answer 1

81-x/√y+9=(81-x)√y+9/√y+9*√y+9=(81-x)√y+9/y+9

Answer 2

спасибо

Answer 3

(81-x)/(√y+9)=(81-x)(√y-9)=(√y+9)(√y-9)=(81-x)(√y-9)/(y-81)