<span>1.2+2277988=2277990
2.33589+3*99=33886
1)</span><span>3*99=297
2)</span><span>33589+297=33886
3.44+446=</span>490
====================================================
(х+4 9/11)-5 6/11=1 8/11
(х+53/11)-61/11=19/11
х+53/11=19/11+61/11
х+53/11=80/11
х=80/11-53/11
х=27/11
х=2 5/11
13 2/9-(7 5/9+у)=3 5/9
119/9-68/9+у=32/9
у=32/9-119/9+68/9
у=-19/9
у=-2 1/9