算数题 求解1/1X2+1/2X3+1/3X4+1/4X5+1/5X6+1/7X8要过程
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算数题 求解
1/1X2+1/2X3+1/3X4+1/4X5+1/5X6+1/7X8
要过程
1/1X2+1/2X3+1/3X4+1/4X5+1/5X6+1/7X8
要过程
1/1X2+1/2X3+1/3X4+1/4X5+1/5X6++1/6×7+1/7X8
=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6++1/6-1/7+1/7-1/8
=1/2-1/8
=3/8
再问: 1/1X2+1/2X3+1/3X4+1/4X5+1/5X6++1/6×7+1/7X8 没有1/6X7
再答: 估计是你出题有误,我加上的 1/1X2+1/2X3+1/3X4+1/4X5+1/5X6++1/6×7+1/7X8 =1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8 =1/2-1/8 =3/8
再问: 题目没有错..就是这样的.
再答: 那就是 1/1X2+1/2X3+1/3X4+1/4X5+1/5X6+1/7X8 =1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/56 =1/2--1/6+1/56 =1/3+1/56 =59/168
=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6++1/6-1/7+1/7-1/8
=1/2-1/8
=3/8
再问: 1/1X2+1/2X3+1/3X4+1/4X5+1/5X6++1/6×7+1/7X8 没有1/6X7
再答: 估计是你出题有误,我加上的 1/1X2+1/2X3+1/3X4+1/4X5+1/5X6++1/6×7+1/7X8 =1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8 =1/2-1/8 =3/8
再问: 题目没有错..就是这样的.
再答: 那就是 1/1X2+1/2X3+1/3X4+1/4X5+1/5X6+1/7X8 =1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/56 =1/2--1/6+1/56 =1/3+1/56 =59/168
算数题 求解1/1X2+1/2X3+1/3X4+1/4X5+1/5X6+1/7X8要过程
x8+x7+x6+x5+x4+x3+x2+x+1因式分解
1x2+2x4+3x6+4x8 ------------------------------- 2x3+4x6+6x9+
计算:1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7+1/7x8+1/8x9+1/9x10.
2x2/1x3+4x4/3x5+6x6/5x7+8x8/7x9+10x10/9x11+12x12/11x13 仔细看看
1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101
1.如果1+X+X2+X3=0,求X+X2+X3+X4+X5+X6+X7+X8的值为?
一道数学题:如果1+x+x2+x3=0,求x+x2+x3+x4+x5+x6+x7+x8的值
(1x2+2x4+3x6+4x8)/(2x3+4x6+6x9+8x12)
某同学在做一道题:求代数式10x9+9x8+8x7+7x6+6x5+5x4+4x3+3x2+2x+1当x=-1时的值.由
因式分解:X15+X14+X13+X12+X11+X10+X9+X8+X7+X6+X5+X4+X3+X2+X+1
某同学做一道数学题:当x=-1时,求10x9+9x8+8x7+7x6+6x5+5x4+4x3+3x2+2x+1的值,由于