Предмет: Математика, автор: хахаха1111

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

Ответы

Автор ответа: ФАИНА1984
0
1/11+1/5+4/11+4/5+6/11=(111+411+611)+(15+45)=1111+55=1+1=2
1/15+4/15+1/18+5/18+2/21+5/21+1/24+7/24=(115+415)+(118+518)+(221+521)+
+(124+724)=515+618+721+824=13+13+13+13=43=1 13
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