分子全是2,先把2给提出来就剩下1/3*5+1/5*7+1/7*9+……+1/97*99先看1/3*5=1/2x(1/3-1/5)=1/2x2/15=1/151/5*7也可以拆成1/2x(1/5-1/7)=1/2x2/35=1/35则式子2/3*5+2/5*7+2/7*9+······+2/97*99=2(1/3*5+1/5*7+1/...
2/3*5+2/5*7+2/7*9+······+2/97*99
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相关问题
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2/(1*3)+2/(3*5)+2/(5*7)+2/(7*9)+.+2/(95*97)+2/(97*99)=?
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2/1*3+2/3*5+2/5*7+2/7*9+……+2/97*99的简便运算
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2/1*3+2/3*5+2/5*7……+2/97*99+2/99*101
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2/1*3+2/3*5+2/5*7+.+2/97*99=2/99*101
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2/(1*3)+2/(3*5)+2/(5*7)+……+2/(97*99)
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1+2+3+4+5+6+7+8+9…+97+98+99=?
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(1/2)^9*3^5*(-1/3)^5*(-5)^7*(-2)^9*(1/5)^7= 0^99+(-1)^99-(-2
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2/3*5+2/5*7+2/7*9+2/9*11+...+2/99*101
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2/1X3+2/3X5+2/5X7+.+2/97X99=
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计算:1+2-3+4+5-6+7+8-9+…+97+98-99.