|1-1/2|+|1/3-1/4|……|1/9-1/10|等于多少啊?,
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11-1/2|+|1/3-1/4|……|1/9-1/10|等于多少啊?
1/2+1/12+1/30+1/56+1/90=74/120+1/56+1/90
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|1/2-1|+|1/3-1/2|+|1/4-1/3|+…+|1/10-1/9|.等于多少啊?
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1/2+(1/3+2/3)+(1/4+2/4+3/4)+.+(1/10+2/10+……+9/10)
1=1;1—4=—〔1+2〕=—3;1—4+9=1+2+3=6;1—4+9—16=—〔1+2+3+4〕=—10…….第1
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化简:[1/(2+√2)]+[1/(3√2+2√3)]+[1/(4√3+3√4)]+……+[1/(10√9+9√10)]