30×(х×6)=189.720 3.438+х÷6=10.004 (800-180)÷х=20 ДАЮ 30 БАЛОВ!!!!!

30*(x*6)=189.720 x*6=189720:30 x*6=6324 x=6324:6 x=1054 3.438+x:6=10004 x:6=10004-3438 x:6=6566 x=6566*6 x=39396 (800-180):x=20 620:x=20 x=620:20 x=31