解答下面数学问题?
2019-12-23 · 知道合伙人教育行家
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参考答案如下:
1/(1×3)+1/(3×5)+1/(5×7)+……+1/(17×19)
=(1/2)(1-1/3)+(1/2)(1/3-1/5)+(1/2)(1/5-1/7)+...(1/2)(1/17-1/19)+(1/2)(1/49-1/51)
=(1/2)(1-1/3+1/3-1/5+1/5-1/7+...-1/17+1/17-1/19)
=(1/2)(1-1/19)
=1/2×18/19
=9/19
1/(1×3)+1/(3×5)+1/(5×7)+……+1/(17×19)
=(1/2)(1-1/3)+(1/2)(1/3-1/5)+(1/2)(1/5-1/7)+...(1/2)(1/17-1/19)+(1/2)(1/49-1/51)
=(1/2)(1-1/3+1/3-1/5+1/5-1/7+...-1/17+1/17-1/19)
=(1/2)(1-1/19)
=1/2×18/19
=9/19
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1/(1x3)+1/(3x5)+....+1/(17x19)
=1/2x(1-1/3)+1/2x(1/3-1/5)+.....+1/2x(1/17-1/19)
=1/2x(1-1/3+1/3-1/5+....+1/17-1/19)
=1/2x(1-1/19)
=1/2x18/19
=9/19
=1/2x(1-1/3)+1/2x(1/3-1/5)+.....+1/2x(1/17-1/19)
=1/2x(1-1/3+1/3-1/5+....+1/17-1/19)
=1/2x(1-1/19)
=1/2x18/19
=9/19
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