1,-9,25,-49,_____,_______.找规律
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![1,-9,25,-49,_____,_______.找规律](/uploads/image/z/209055-39-5.jpg?t=1%2C-9%2C25%2C-49%2C_____%2C_______.%E6%89%BE%E8%A7%84%E5%BE%8B)
1,-9,25,-49,_____,_______.找规律
1,-9,25,-49,_____,_______.找规律
1,-9,25,-49,_____,_______.找规律
1=1^2
-9=-(3)^2
25=5^2
-49=-(7)^2
81=9^2
-121=-(11)^2
1,-9,25,-49,81,-121
81 -121
81 -121
(-1)^(n+1)*(2n-1)²
1,-9,25,-49,__81___,___-121____.
1,-9,25,-49,81,-121
奇数的平方序列一正一负