№1 (х+4ц 9/11) - 5 ц 6/11= 1 ц 8/11  №2 13ц 2/9 - (7 5/9 + у) = 3 ц 5/9     ПОЖАЛУЙСТА РЕШИТЕ) 

(х+4.9/11)-5.6/11=1.8/11 х+4.9/11=1.8/11+5.6/11 х+4.9/11=6.14/11 х+4.9/11=7.3/11 х=7.3/11-4.9/11 х=(7-4)+(3/11-9/11) х=3.3-9/11 х=2.11+3-9/11 х=2.5/11 проверяем (2.5/11+4.9/11)-5.6/11=1.8/11 13.2/9-(7.5/9+у)=3.5/9 7.5/9+у=13.2/9-3.5/9 7.5/9+у=(13-3)+(2/9-5/9) 7.5/9+у=10.2-5/9 7.5/9+у=9.9+2-5/9 7.5/9+у=9.6/9 у=9.6/9-7.5/9 у=2.1/9 проверяем 13.2/9-(7.5/9+2.1/9)=3.5/9