1-1/6-1/12-1/20-1/30-1/42=?要过程7号前要,很急!!!!!!!!!!!!!!!

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1-1/6-1/12-1/20-1/30-1/42=?要过程7号前要,很急!!!!!!!!!!!!!!!
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1-1/6-1/12-1/20-1/30-1/42=?要过程7号前要,很急!!!!!!!!!!!!!!!
1-1/6-1/12-1/20-1/30-1/42=?要过程
7号前要,很急!!!!!!!!!!!!!!!

1-1/6-1/12-1/20-1/30-1/42=?要过程7号前要,很急!!!!!!!!!!!!!!!
1-1/6-1/12-1/20-1/30-1/42=1-(1/2-1/3)-(1/3-1/4)-(1/4-1/5)-(1/5-1/6)-(1/6-1/7)=1-1/2+1/3-1/3+1/4-1/4+1/5-1/5+1/6-1/6+1/7=1/2+1/7=9/14