(-1)*(-2)*(-3)+(-2)*(-3)*(-4)+(-3)*(-4)*(-5)+~+(-100)*(-101)*(-102)
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![(-1)*(-2)*(-3)+(-2)*(-3)*(-4)+(-3)*(-4)*(-5)+~+(-100)*(-101)*(-102)](/uploads/image/z/1251690-42-0.jpg?t=%EF%BC%88-1%EF%BC%89%2A%EF%BC%88-2%EF%BC%89%2A%EF%BC%88-3%EF%BC%89%2B%EF%BC%88-2%EF%BC%89%2A%EF%BC%88-3%EF%BC%89%2A%EF%BC%88-4%EF%BC%89%2B%EF%BC%88-3%EF%BC%89%2A%EF%BC%88-4%EF%BC%89%2A%EF%BC%88-5%EF%BC%89%2B%EF%BD%9E%2B%EF%BC%88-100%EF%BC%89%2A%EF%BC%88-101%EF%BC%89%2A%EF%BC%88-102%EF%BC%89)
(-1)*(-2)*(-3)+(-2)*(-3)*(-4)+(-3)*(-4)*(-5)+~+(-100)*(-101)*(-102)
(-1)*(-2)*(-3)+(-2)*(-3)*(-4)+(-3)*(-4)*(-5)+~+(-100)*(-101)*(-102)
(-1)*(-2)*(-3)+(-2)*(-3)*(-4)+(-3)*(-4)*(-5)+~+(-100)*(-101)*(-102)
b(n)=(n-1)n(n+1) =n^3-n
1+2+3+4+5+.+n=(n+1)n/2
1^3+2^3+3^3+4^3+5^3………………+n^3=n^2(n+1)^2/4
那么s=n^2(n+1)^2/4- (n+1)n/2 那么 带入n=101 提取负号 得 结果 -26 527 650
()()()104 2 1 ()3 ()()()8 ()()()
(1)(2)(3)
(1)(2)(3)谁会,
7(1)(2)(3)
(1),(2),(3)题咋做?
1()2()3()4
4.(1)(2)(3).
解答(1)(2)(3)
(1)(2)(3)题
(1).(2).(3).
计算(1)(2)(3)
(1)(2)(3)谁帮下忙
(1)(2)(3)题,
(1) (2) (3) (4) (5)
1)2)3)4)5)
1) 2) 3) 4) 5)
1、().()5* 2()--------------()3()()1()--------------2.()()52、()()()* 8.9---------------()()()()()()()---------------()()()()3、 ().7()()()
小学2年纪找规律数学题(1,3)(2,)( ,)( ,3)( ,) ( ,)(3,2) ( ,)( ,1)(2,1)( ,) ( ,)