(1+2+3)+(2+3+4)+(3+4+5)+……(498+499+500)=?谁能告示
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/24 02:33:56
(1+2+3)+(2+3+4)+(3+4+5)+……(498+499+500)=?谁能告示(1+2+3)+(2+3+4)+(3+4+5)+……(498+499+500)=?谁能告示(1+2+3)+(2
(1+2+3)+(2+3+4)+(3+4+5)+……(498+499+500)=?谁能告示
(1+2+3)+(2+3+4)+(3+4+5)+……(498+499+500)=?
谁能告示
(1+2+3)+(2+3+4)+(3+4+5)+……(498+499+500)=?谁能告示
(1+2+3)+(2+3+4)+(3+4+5)+……(498+499+500)
= 1 + 2 * 2 + 3 * 3 + 4 * 3 + 5 * 3 + ... + 498 * 3 + 499 * 2 + 500
= (1 + 2 + 3 + ... + 499) * 3 - 1 * 2 - 2 * 1 - 499 * 1 + 500
= (1 + 499) * 499 / 2 * 3 - 2 - 2 + 1
= 250 * 499 * 3 - 3
= 374250 - 3
= 374247
1 2 3 4 ()
1()2()3()4
2/3,1,6/5,4/3,( ),3/2
(+4/3)-(+8)+(-2 3/4)-(-1 3/2)=过程=?
1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),
1/2-(3/4-3/8), 1/2+1/4-1/6 , 2/3+(1/2+1/4),1/2-(3/4-3/8), 1/2+1/4-1/6 , 2/3+(1/2+1/4),
1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),
0-21又2/3+(+3又1/4)-(-2/3)-(+1/4)
0-(+2/1)-(+5/2)-(-4/3)-(+4/1)-(-5/3)
1,2,2,4,3,8,4,16,()()
3/4{3/4(1/2t-1/4)-8]=2/3t-1
1/2!+2/3!+3/4!+.+n/(n+1)!
计算((1/3)^2)×4^0+((1/3)^4)×4^1+((1/3)^6)×4^2+…+((1/3)^2n)×4^(n-1)
(4/5+1/4)÷2/3+3/10
(1) (2) (3) (4) (5)
1)2)3)4)5)
1) 2) 3) 4) 5)
计算4(3^2+1)(3^4+1).(3^2006+1)