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次數是偶數就為正的,奇數的話就是負的,所以應該是-1
(-1/9)^8*(-3)^18 =(-1/3)^2^8 *(-3)^18 =(-1/3)^16 *(-3)^18 =[(-1/3)*(-3)]^16 *(-3)^2 =1^16 *(-3)^2 =1*9 =9
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