3/2-17/6+37/12-99/20+151/30-293/42+393/56-647/72+811/90等于多少,

kisser20052022-10-04 11:39:541条回答

3/2-17/6+37/12-99/20+151/30-293/42+393/56-647/72+811/90等于多少,有谁知道,知者肯定给分.

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出水莲儿 共回答了15个问题 | 采纳率86.7%
原式=(1+2)/2-(18-1)/6+(36+1)/12-(100-1)/20+(150+1)/30-(292-1)/42+(294-1)/42+(392+1)/56-(648-1)/72+(810+1)/90
=1+1/2-3+1/6+3+1/12-5+1/20+5+1/30-7+1/42+7+1/56-9+1/72+9+1/90
=1+1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
=1+1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9+1/9*10
=1+1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10
=19/10
1年前

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=1+1/1*2-3+1/2*3+3+1/3*4-5+1/4*5+5+1/5*6-7+1/6*7
=1-3+3-5+5-7+1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7
=-6+1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7
=-5-1/7
=-36/7
1.求 3/2-17/6+37/12-99/20+151/30-293/42+393/56-647/72+811/90的
1.求 3/2-17/6+37/12-99/20+151/30-293/42+393/56-647/72+811/90的值
2.若|a|=3,|b|=1,|c|=5且|a+b|=a+b,|a+c|=-(a+c),求a-b+c的值
lihm51年前3
tiancaixu 共回答了13个问题 | 采纳率92.3%
第一题:是先变形分子3=2*1,17=6*3—1,37=12*3+1.647=72*9—1,811=90*9+1然后去分母变形得到1+1/2+1/6+1/12+1/20+...+1/90再6=2*3,12=3*4.90=9*10拆开得到1/6=1/2-1/3...1/90=1/9-1/10合并结果1.4第二题:因为|a+b|=...