初中数学题啊,紧急啊!~~3.9.27.81.243.729…………1.7.25.79.241.727…………1.3.9
2个回答
(n+1)!=(n+1)*n!
所以100!=100*99*98!
答案是9900 !
给分给分!
相关问题
观察下面的数(1)3,9,27,81,243,729,...(2)1,7,25,79,241,727,...(3)1,3
一道数学题~~大家进来看看!观察下面的数:3,9,27,81,243,729,…1,7,25,79,241,727,…1
①-3,9,-27,81,-243,729,...②0,12,-24,84,-241,732,...③-1,3,-9,2
1+3+9+27+81+243+729
1/3+1/9+1/27+1/81+1/243+1/729
一、观察下面的三列数:①3,-9,27,-81,243…②1,-11,25,-83,241… ③-1,3,-9,27,-
1-1/3-1/9-1/27-1/81-1/243-1/729=?
观察下面三行数:-3,9,-27,81,-243,…-5,7,-29,79,-245,…-1,3,-9,27,-81…(
计算:1+1/3+1/9+1/27+1/81+1/243+1/729
3,9,27,81,243,729.有什么规律