1/2+[2/(2*3)]+[3/(2*3*4)]+[4/(2*3*4*5)]+[5/(2*3*4*5*6)] 这道题怎
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/10/07 02:27:29
1/2+[2/(2*3)]+[3/(2*3*4)]+[4/(2*3*4*5)]+[5/(2*3*4*5*6)] 这道题怎么简算呢?
=1/2+[2/(2*3)]+[3/(2*3*4)]+[4/(2*3*4*5)]+[5/(2*3*4*5*6)] +[1/(2*3*4*5*6)] -[1/(2*3*4*5*6)]
=1/2+[2/(2*3)]+[3/(2*3*4)]+[4/(2*3*4*5)]+[6/(2*3*4*5*6)] -[1/(2*3*4*5*6)]
=1/2+[2/(2*3)]+[3/(2*3*4)]+[4/(2*3*4*5)]+[1/(2*3*4*5)] -[1/(2*3*4*5*6)]
=1/2+[2/(2*3)]+[3/(2*3*4)]+[5/(2*3*4*5)] -[1/(2*3*4*5*6)]
=1/2+[2/(2*3)]+[3/(2*3*4)]+[1/(2*3*4)]-[1/(2*3*4*5*6)]
=.
=1-[1/(2*3*4*5*6)]
=1/2+[2/(2*3)]+[3/(2*3*4)]+[4/(2*3*4*5)]+[6/(2*3*4*5*6)] -[1/(2*3*4*5*6)]
=1/2+[2/(2*3)]+[3/(2*3*4)]+[4/(2*3*4*5)]+[1/(2*3*4*5)] -[1/(2*3*4*5*6)]
=1/2+[2/(2*3)]+[3/(2*3*4)]+[5/(2*3*4*5)] -[1/(2*3*4*5*6)]
=1/2+[2/(2*3)]+[3/(2*3*4)]+[1/(2*3*4)]-[1/(2*3*4*5*6)]
=.
=1-[1/(2*3*4*5*6)]
1/2+[2/(2*3)]+[3/(2*3*4)]+[4/(2*3*4*5)]+[5/(2*3*4*5*6)] 这道题怎
{3/4+4/5+5/6}+{1+2/3+3/4+4/5}-{1+2/3+3/4+4/5+5/6}×{2/3+3/4+4
2 3 4 5 6
(1)(1+2/3+3/4+4/5+5/6)*(1+3/4+4/5)-(1+3/4+4/5)*(2/3+3/4+4/5+
:(1/2+2/3+3/4+4/5+5/6+6/7)+(1/2+2/3+3/4+4/5+5/6+6/7)*1/2—(1+
1 2 3 4 5
.1,2,3,4,5,
1/2+2/2×3+3/2×3×4+4/2×3×4×5+5/2×3×4×5×6拜托各位了 3Q
1/1 ,1/2 ,2/2,1/3,2/3,3/3 ,1/4,2/4,3/4,4/4 ,1/5,2/5----(找规律)
(-1/4)+5/6+2/3-1/2
1+2+3+1+2+3-4+5+6
1×2×3×4+2×3×4×5+3×4×5×6+.+99×100×101×102