有理数的乘除法的问题
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\u8d1f\u6570\u8d1f\u6570\u8d1f\u6570
1.1/30,1/n*(n+1)2.(-30)*(1/2-2/3+4/5)=-30*1/2+30*2/3-30*4/5=-15+20-24=-19
3.-1.2*4+1.8+1.6-2.8=-4.2
亏损4.2万元
4.-1/n*1/(n+1)=-1/n+1/(n+1)
原式=-1+1/2-1/2+1/3-1/3+1/4-.....+1/2008-1/2008+1/2009
=-1+1/2009
=-2008/2009
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绛旓細鏈夌悊鏁板垎涓烘鏁板拰璐熸暟鍜0锛鏈夌悊鏁扮殑涔娉曟硶鍒欐槸锛岃礋璐熷緱姝ｏ紝姝ｆ寰楁锛屾璐熷緱璐燂紝涓鍒囨暟涓0鐩镐箻寰0
绛旓細鏈夌悊鍒嗘暟:鍏堟妸鎵鏈夊垎鏁扮害鍒.濡傛灉鏈夊伓鏁颁釜璐熸暟,绛旀灏变竴瀹氭槸姝ｆ暟.鏈夊鏁颁釜璐熸暟,绛旀灏变竴瀹氭槸璐熸暟.纭畾浜嗘璐熷悗,鐩存帴涓鎶婁箻.鏈夌悊鏁存暟:鍏堜粩缁嗙湅棰樼洰,濡傛灉鏈夊伓鏁颁釜璐熸暟,绛旀灏变竴瀹氭槸姝ｆ暟.鏈夊鏁颁釜璐熸暟,绛旀灏变竴瀹氭槸璐熸暟.纭畾浜嗘璐熷悗,鐩存帴涓鎶婁箻.
