9-√（9-x）² +9² =√ x²-9谁能帮我解9-√{（9-x）² +9²} =√ x²-9

9-√（9-x）² +9² =√ x²-9谁能帮我解9-√{（9-x）² +9²} =√ x²-9
9-√（9-x）² +9² =√ x²-9谁能帮我解
9-√{（9-x）² +9²} =√ x²-9

9-√（9-x）² +9² =√ x²-9谁能帮我解9-√{（9-x）² +9²} =√ x²-9
9-（x-9）+9^2=√x^2-9
81+18-x=√x^2-9
(99-x）^2=x^2-9
99^2-198x+x^2=x^2-9
198x=99^2+9
x=9810÷198
x=4905/89