=1/1*4+1/4*7+1/7*10+……+1/97*100
=(1/3)*(1-1/4)+(1/3)*(1/4-1/7)+(1/3)*(1/7-1/10)+……+(1/3)*(1/97-1/100)
=(1/3)*(1-1/4+1/4-1/7+1/7-1/10+……+1/97-1/100)
=(1/3)*(1-1/100)
=33/100
1/4+1/28+1/70.+1/9700
3个回答
相关问题
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1/4+1/28+1/70+.+1/9700
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1/4+1/28+1/70+.+1/9700=?
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1/4+1/28+1/70+.+1/9700 要过程 拜托啦~!
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解方程:(1/4+1/28+1/70+.+1/9700)x+(-6)^2=3
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1/4+1/28+1/70+…1/89698=?
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1/4+ 1/28+1/70+1/130+1/208=?
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[1/4]+[1/28]+[1/70]+[1/130]+[1/208]=______．
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1/4+1/28+1/70+……+1/550（利用裂项）
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4/1+28/1+70/1+130/1+208/1=?简算
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一道数学算式4/1+28/1+70/1+130/1+208/1等于多少?