已知实数x,y满足 y=√x^2-4+√4-x^2分之x-2 +3 ,求9x+8y的值.

已知实数x,y满足 y=√x^2-4+√4-x^2分之x-2 +3 ,求9x+8y的值.
已知实数x,y满足 y=√x^2-4+√4-x^2分之x-2 +3 ,求9x+8y的值.

已知实数x,y满足 y=√x^2-4+√4-x^2分之x-2 +3 ,求9x+8y的值.
y=√x^2-4+√4-x^2/(x-2)+3
x^2-4>=0
4-x^2>=0
x-2≠0
解得：x=-2
y=3
9x+8y=9×(-2)+8×3=6