Ответы и объяснения

2014-02-18T23:46:42+04:00
1)7.7/30-(5.11/30-у)=3.19/30 5.11/30-у=7.7/30-3.19/30 5.11/30-у=3.18/30 у=5.11/30-3.18/30 у=1.23/30 2)(х-1.9/17)+2.14/17=5.5/17 х-1.9/17=5.5/17-2.14/17 х-1.9/17=2.8/17 х=1.9/17+2.8/17 х=4