Ответ:
1) (3.9+5.1)+6.83=9+6.83=15.83
2)7,26+(3.89+14.74)= 3.89+(7.26+15.74)=3.89+23=26.89
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Ответ:
1) (3.9+5.1)+6.83=9+6.83=15.83
2)7,26+(3.89+14.74)= 3.89+(7.26+15.74)=3.89+23=26.89