выполните более рациональным способом:
1/11+1/5+4/11+4/5+6/11;
1/15+4/15+1/18+5/18+2/21+5/21+1/24+7/24
1/11+1/5+4/11+4/5+6/11;
1/15+4/15+1/18+5/18+2/21+5/21+1/24+7/24
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1/11+1/5+4/11+4/5+6/11=(1\11+4\11+6\11)+(1\5+4\5)=11\11+5\5=1+1=21/15+4/15+1/18+5/18+2/21+5/21+1/24+7/24=(1\15+4\15)+(1\18+5\18)+(2\21+5\21)+
+(1\24+7\24)=5\15+6\18+7\21+8\24=1\3+1\3+1\3+1\3=4\3=1 1\3