计算:1x(x+1)+1(x+1)(x+2)+1(x+2)(x+3)+.+1(x+2013)(x+2014)
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计算:1x(x+1)+1(x+1)(x+2)+1(x+2)(x+3)+.+1(x+2013)(x+2014)计算:1x(x+1)+1(x+1)(x+2)+1(x+2)(x+3)+.+1(x+2013)
计算:1x(x+1)+1(x+1)(x+2)+1(x+2)(x+3)+.+1(x+2013)(x+2014)
计算:1x(x+1)+1(x+1)(x+2)+1(x+2)(x+3)+.+1(x+2013)(x+2014)
计算:1x(x+1)+1(x+1)(x+2)+1(x+2)(x+3)+.+1(x+2013)(x+2014)
原式=1x-1(x+1) + 1(x+1)-1(x+2) + …… + 1(x+2013)-1(x+2014)=1x-1(x+2014)=2013x(x+2014)
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