Ответ:
1)2/7+9/11+5/7+2/11= (2/7+5/7)+(9/11+2/11)=7/7+11/11=1+1=2
2)5/24+11/30+3/30+7/24=(5/24+7/24)+(11/30+3/30)=12/24+14/30=1/2+13/30=15/30+13/30=28/30
3)15/16+3/20+7/20+5/16=(15/16+5/16)+(3/20+7/20)=20/16+10/20=5/4+1/2=1 1/4+1/2=1 1/4+2/4=1 3/4
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Ответ:
1)2/7+9/11+5/7+2/11= (2/7+5/7)+(9/11+2/11)=7/7+11/11=1+1=2
2)5/24+11/30+3/30+7/24=(5/24+7/24)+(11/30+3/30)=12/24+14/30=1/2+13/30=15/30+13/30=28/30
3)15/16+3/20+7/20+5/16=(15/16+5/16)+(3/20+7/20)=20/16+10/20=5/4+1/2=1 1/4+1/2=1 1/4+2/4=1 3/4