X÷(1×2)+X÷(2×3)+…+X÷(2007×2008)=2007x=多少?
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X÷(1×2)+X÷(2×3)+…+X÷(2007×2008)=2007x=多少?X÷(1×2)+X÷(2×3)+…+X÷(2007×2008)=2007x=多少?X÷(1×2)+X÷(2×3)+…+
X÷(1×2)+X÷(2×3)+…+X÷(2007×2008)=2007x=多少?
X÷(1×2)+X÷(2×3)+…+X÷(2007×2008)=2007
x=多少?
X÷(1×2)+X÷(2×3)+…+X÷(2007×2008)=2007x=多少?
x/1*2+x/2*3+x/3*4+...+x/2007*2008=2007
x(1-1/2+1/2-1/3+...+1/2006-1/2007+1/2007-1/2008)=2007
2007x/2008=2007
x=2008
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