用加减乘除乘方计算：3 -3 9 -9=+-24,

（-3）*（-9）-（9/3）=24

(3-(-3-9))--9
3-(-3-(9--9))
3-((-3-9)+-9)
((3--3)+9)--9
(3--3)+(9--9)
(3--3)-(-9-9)
((3--3)--9)+9
3-((-3+-9)-9)
3-(-3+(-9-9))
(3-(-3+-9))+9
(3-(-3/-9))*9
((3+9)--3)--9
3+((9--3)--9)
(3+(9--3))--9
3+(9-(-3+-9))
(3+9)-(-3+-9)
((3/9)+-3)*-9
((3+9)--9)--3
3+((9--9)--3)
(3+(9--9))--3
3+(9-(-9+-3))
(3+9)-(-9+-3)
(3*9)-(-9/-3)
(3--9)-(-3-9)
((3--9)--3)+9
3-((-9+-3)-9)
3-(-9+(-3-9))
(3-(-9+-3))+9
((3/-9)--3)*9
(3-(-9-9))--3
3-(-9-(9--3))
3-((-9-9)+-3)
((3--9)+9)--3
(3--9)+(9--3)
(-3+(3/9))*-9
-3-(9/(3/-9))
-3-((9/3)*-9)
-3-((9*-9)/3)
-3-(9*(-9/3))
-3-(-9/(3/9))
-3-((-9/3)*9)
-3-((-9*9)/3)
-3-(-9*(9/3))
(-3*-9)-(9/3)
((9+3)--3)--9
9+((3--3)--9)
(9+(3--3))--9
9+(3-(-3+-9))
(9+3)-(-3+-9)
9*(3-(-3/-9))
((9+3)--9)--3
9+((3--9)--3)
(9+(3--9))--3
9+(3-(-9+-3))
(9+3)-(-9+-3)
(9*3)-(-9/-3)
9*((3/-9)--3)
(9-(-3-3))--9
9-(-3-(3--9))
9-((-3-3)+-9)
((9--3)+3)--9
(9--3)+(3--9)
(9/-3)-(3*-9)
(9--3)-(-9-3)
((9--3)--9)+3
9-((-3+-9)-3)
9-(-3+(-9-3))
(9-(-3+-9))+3
(9/-3)-(-9*3)
(9/(-3/-9))-3
((9/-3)*-9)-3
(9-(-9-3))--3
9-(-9-(3--3))
9-((-9-3)+-3)
((9--9)+3)--3
(9--9)+(3--3)
(9--9)-(-3-3)
((9--9)--3)+3
9-((-9+-3)-3)
9-(-9+(-3-3))
(9-(-9+-3))+3
((9*-9)/-3)-3
(9*(-9/-3))-3
(-9/3)-(-3*9)
(-9/3)-(9*-3)
-9*((3/9)+-3)
-9*(-3+(3/9))
(-9/(-3/9))-3
((-9/-3)*9)-3
(-9*-3)-(9/3)
((-9*9)/-3)-3
(-9*(9/-3))-3

3×9-9÷3=24