When x is a real number, the following expressions are meaningful in the range of real numbers (1) Radical x + 5-radical 4-2x (2) 2-x radical x + 2 (3) The root of X + 2 is X-2

1) X + 5 ≥ 0 and 4-2x ≥ 0,
X ≥ - 5 and X ≤ 2,
So - 5 ≤ x ≤ 2
2)2-x≠0,x+2≥0
x≠2,x≥-2
So x ≥ - 2 and X ≠ 2
3）x+2≠0,x-2≥0
x≠-2,x≥2
So x ≥ 2

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