1. Given the function Y1 = x (x > 0) and function y2 = 1 / X (x > 0), then=____ The minimum value of Y1 + Y2 is____ . 2. Given function Y1 = x + 1 (x > - 1) and function y2 = (x + 1) & # + 4 (x > - 1), then=____ The minimum value of Y2 / Y1 is___ .

1. Given the function Y1 = x (x > 0) and function y2 = 1 / X (x > 0), then=____ The minimum value of Y1 + Y2 is____ . 2. Given function Y1 = x + 1 (x > - 1) and function y2 = (x + 1) & # + 4 (x > - 1), then=____ The minimum value of Y2 / Y1 is___ .

（1）
y1+y2=x+1/x≥2
The minimum value of 2 is obtained when x = 1
That is, when x=___ 1_ The minimum value of Y1 + Y2 is_ 2___ .
（2）
y2/y1=[(x+1)²+4]/(x+1)=(x+1)+4/(x+1)≥4
When x + 1 = 2, i.e. x = 1, the minimum value of 4 is obtained
Then when x=__ 1__ The minimum value of Y2 / Y1 is 4