找规律计算题1×2×3+2×3×4+•••+n(n+1)(n+2)=?(只需写出结果,我也不容易啊!
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找规律计算题1×2×3+2×3×4+•••+n(n+1)(n+2)=?(只需写出结果,我也不容易啊!
找规律计算题
1×2×3+2×3×4+•••+n(n+1)(n+2)=?
(只需写出结果,我也不容易啊!
找规律计算题1×2×3+2×3×4+•••+n(n+1)(n+2)=?(只需写出结果,我也不容易啊!
1×2×3+2×3×4+...+n(n+1)(n+2)=
1*2*3=1/4(1*2*3*4-0*1*2*3)
2*3*4=1/4(2*3*4*5-1*2*3*4)
.
n(n+1)(n+2)=1/4(n(n+1)(n+2)(n+3)-(n-1)n(n+1)(n+2))
所以
1×2×3+2×3×4+...+n(n+1)(n+2)=[n(n+1)(n+2)(n+3)]/4
34NDDDDDDDDDDDDDDDDDDDDDDD