作业帮求和:1/1x4+1/4x7+···+1/(3n-2)x(3n+1)要精准一点的,快~~~谢啦
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求和:1/1x4+1/4x7+···+1/(3n-2)x(3n+1)要精准一点的,快~~~谢啦
求和:1/1x4+1/4x7+···+1/(3n-2)x(3n+1)
要精准一点的,快~~~谢啦
求和:1/1x4+1/4x7+···+1/(3n-2)x(3n+1)要精准一点的,快~~~谢啦
原式=1/3（1-1/4+1/4-1/7+……+1/3n-2-1/3n+1）
=1/3(1-1/3n+1)
=1/3(3n/3n+1)
=n/3n+1
求和:1/1x4+1/4x7+···+1/(3n-2)x(3n+1)要精准一点的,快~~~谢啦
1/1x4+1/4x7+…+1/97x100
x1-x2+x3=1x2-x3+x4=21若x1,x2,x3,x4,x5满足方程组 x3-x4+x5=3x4-x5+x1=4x5-x1+x2=5求x2 x3 x4的值2已知 x1+x4+x6+x7=39 x2+x4+x5+x7=49 x3+x5+x6+x7=41 x4+x7=13 x5+x7=14 x6+x7=9 x1+x2+x3+x4+x5+x6+x7=9求x7的值若x1,x2,x3,x4,x5满足方程组 x1-x
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1/1x4+1/4x7+1/7x10+……+1/2005x2008
1X4/1+4X7/1+7X10/1+…+2005X2008/1=?
1/1x4 +1/4x7+1/7x10+.+1/100x103 急用啊