1,-9,25,-49,_____,_______.找规律
问题描述:
1,-9,25,-49,_____,_______.找规律
答
81 -121
(-1)^(n+1)*(2n-1)²
答
1,-9,25,-49,__81___,___-121____.
答
1,-9,25,-49,81,-121
奇数的平方序列一正一负
答
81 -121
答
1=1^2
-9=-(3)^2
25=5^2
-49=-(7)^2
81=9^2
-121=-(11)^2
1,-9,25,-49,81,-121