2.x≥0 and y≥0

simplify

1, radical sign (x-y- 1)+ radical sign (y+ 1-x)+5 If it makes sense, it must be.

X-y- 1≥0 and y+ 1-x≥0.

X-y- 1 = 0。

Therefore, the radical number (x-y- 1)+ radical number (y+ 1-x)+5 = 5.

2, the root number (x? -2x+ 1)+ (root number 1-x)? To be meaningful, there must be.

1-x≥0，

At this time, the root symbol (x? -2x+ 1)= | x- 1 | = 1-x

Root sign (x? -2x+ 1)+ (root number 1-x)? =2( 1-x)