启东中学作业本七上数学第30面第十五题答案
\u6570\u5b66\u542f\u4e1c\u4e2d\u5b66\u4f5c\u4e1a\u672c\u4e03\u5e74\u7ea7\u4e0a15\u523020\u9875\u7b54\u6848P15 \u4e00\u3001BBADC \u4e8c\u30016\u3001\uff081\uff09101\uff0c+\uff08-5\uff09... (2)-4.3,-3/5,-0.01001,-|3/4|,+(-5)... (3)-4.3,-3/5,-(-22/7),-0.01001,-|+3/4|... (4\uff09|0|... 7\u30011\uff1b-1\uff1b0\uff1b0\uff1b0\uff1b\u6ca1\u6709\uff1b+1\u6216-1 8\u3001;>;> 9\u30010;4;< 10\u30012013
\u6211\u53ea\u80fd\u7ed9\u4f60\u9009\u62e9\u9898\u7684\u7b54\u6848\uff1a1.B 2.D 3.D 4.A 5.C
=（1/1+1/2+……+1/9）-（2/1+2/2+……2/8）+……+（7/1+7/2+7/3）-（8/1+8/2）+7/1=45-18+……+7/6-8/3+7/1
=27+……+7/6-8/3+7/1
=54/1787
可以发上来吗？交上去了
绛旓細=27+鈥︹+7/6-8/3+7/1 =54/1787
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