а) 2.136:(1.9-х)=7.12
2,136=7,12*(1,9-х)
2,136=13,528-7,12х
2,136-13,528=-7,12х
-11,392=-7,12х
х=-11,392:(-7,12)
х=1,6
б) 4.2 *(0.8+у)=8.82
0,8+у=8,82:4,2
0,8+у=2,1
у=2,1-0,8
у=1,3
а) 2.136:(1.9-х)=7.12; 2,136=13,528-7,12x; x=-11,392/7,12; x=1,6; б) 4.2 *(0.8+у)=8.82; 3,36+4,2y=8,82; y=5,46/4,2; y=1,3
