分数的简便运算【注:“/”前是分子,后是分母】(1)(1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9)×(1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10)-【减号】(1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10)×(1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9)=【是
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